diff --git a/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.inc b/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.inc
index c451ccc91b..d81c7b3eb9 100644
--- a/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.inc
+++ b/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.inc
@@ -4,8 +4,17 @@ esc_html( 'text' );
 esc_html( $var );
 
 esc_html( 'text', 'domain' ); // Warning.
-esc_html( $foo, $bar ); // Warning.
-esc_attr(
+\ESC_HTML( $foo, $bar ); // Warning.
+esc_ATTR(
 	'text', // Some comment.
 	MY_DOMAIN // More comment.
 ); // Warning.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\esc_attr( 'text', 'domain' );
+MyNamespace\esc_html( 'text', 'domain' );
+\MyNamespace\esc_attr( 'text', 'domain' );
+namespace\esc_html( 'text', 'domain' ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\esc_attr( 'text', 'domain' );
diff --git a/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.php b/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.php
index 4218e90dc9..eee562f2d6 100644
--- a/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.php
+++ b/WordPress/Tests/CodeAnalysis/EscapedNotTranslatedUnitTest.php
@@ -36,9 +36,10 @@ public function getErrorList() {
 	 */
 	public function getWarningList() {
 		return array(
-			6 => 1,
-			7 => 1,
-			8 => 1,
+			6  => 1,
+			7  => 1,
+			8  => 1,
+			16 => 1,
 		);
 	}
 }
diff --git a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc
index 07634e769a..fb3beead42 100644
--- a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc
+++ b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc
@@ -20,7 +20,7 @@ current_time( // Error.
 );
 
 current_time( 'timestamp', $gmt ); // Warning.
-current_time( 'timestamp', false ); // Warning.
+\Current_Time( 'timestamp', false ); // Warning.
 current_time( 'U', 0 ); // Warning.
 current_time( 'U' ); // Warning.
 
@@ -30,3 +30,12 @@ current_time( gmt: true, type: 'mysql', ); // OK.
 current_time( type: 'Y-m-d' ); // OK.
 current_time( gmt: true, type: 'timestamp' ); // Error.
 current_time( gmt: 0, type : 'U' ); // Warning.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\current_time( 'timestamp', true );
+MyNamespace\current_time( 'timestamp', true );
+\MyNamespace\current_time( 'timestamp', true );
+namespace\current_time( 'timestamp', true ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\current_time( 'timestamp', true );
diff --git a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc.fixed b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc.fixed
index 5b2fa7e28a..be53fb3148 100644
--- a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc.fixed
+++ b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.inc.fixed
@@ -17,7 +17,7 @@ current_time( // Error.
 );
 
 current_time( 'timestamp', $gmt ); // Warning.
-current_time( 'timestamp', false ); // Warning.
+\Current_Time( 'timestamp', false ); // Warning.
 current_time( 'U', 0 ); // Warning.
 current_time( 'U' ); // Warning.
 
@@ -27,3 +27,12 @@ current_time( gmt: true, type: 'mysql', ); // OK.
 current_time( type: 'Y-m-d' ); // OK.
 time(); // Error.
 current_time( gmt: 0, type : 'U' ); // Warning.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\time();
+MyNamespace\current_time( 'timestamp', true );
+\MyNamespace\current_time( 'timestamp', true );
+namespace\current_time( 'timestamp', true ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\current_time( 'timestamp', true );
diff --git a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.php b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.php
index c667af8234..4525e58d79 100644
--- a/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.php
+++ b/WordPress/Tests/DateTime/CurrentTimeTimestampUnitTest.php
@@ -31,6 +31,7 @@ public function getErrorList() {
 			11 => 1,
 			17 => 1,
 			31 => 1,
+			37 => 1,
 		);
 	}
 
diff --git a/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.1.inc b/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.1.inc
index 5c0ed5729a..bf6450c790 100644
--- a/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.1.inc
+++ b/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.1.inc
@@ -5,7 +5,7 @@ register_post_type( 'my_own_post_type', array() ); // OK.
 register_post_type( 'my-own-post-type-too-long', array() ); // Bad.
 register_post_type( 'author', array() ); // Bad. Reserved slug name.
 register_post_type( 'My-Own-Post-Type', array() ); // Bad. Invalid chars: uppercase.
-register_post_type( 'my/own/post/type', array() ); // Bad. Invalid chars: "/".
+register_POST_TYPE( 'my/own/post/type', array() ); // Bad. Invalid chars: "/".
 
 register_post_type( <<<EOD
 my_own_post_type
@@ -33,7 +33,7 @@ register_post_type( $this->get_post_type_id() ); // Non string literal. Warning
 register_post_type( null, array() ); // Non string literal. Warning with severity: 3
 register_post_type( 1000, array() ); // Non string literal. Warning with severity: 3
 
-register_post_type( 'wp_', array() ); // Bad. Reserved prefix.
+\REGISTER_post_TYPE( 'wp_', array() ); // Bad. Reserved prefix.
 register_post_type( 'wp_post_type', array() ); // Bad. Reserved prefix.
 
 register_post_type( '', array() ); // Bad. Empty post type slug.
@@ -68,3 +68,12 @@ register_post_type(
 	// Post type name.
 	$name,// Non string literal. Warning with severity: 3
 );
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\register_post_type( 'my-own-post-type-too-long', array() ); // Bad.
+MyNamespace\register_post_type( 'my-own-post-type-too-long', array() ); // Ok.
+\MyNamespace\register_post_type( 'my-own-post-type-too-long', array() ); // Ok.
+namespace\register_post_type( 'my-own-post-type-too-long', array() ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\register_post_type( 'my-own-post-type-too-long', array() ); // Ok.
diff --git a/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.php b/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.php
index 821b73ef24..cb2d41c998 100644
--- a/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.php
+++ b/WordPress/Tests/NamingConventions/ValidPostTypeSlugUnitTest.php
@@ -57,6 +57,7 @@ public function getErrorList( $testFile = '' ) {
 					52 => 1,
 					62 => 1,
 					64 => 1,
+					75 => 1,
 				);
 
 			case 'ValidPostTypeSlugUnitTest.2.inc':
diff --git a/WordPress/Tests/PHP/IniSetUnitTest.inc b/WordPress/Tests/PHP/IniSetUnitTest.inc
index c5ef7295d1..96a310cb19 100644
--- a/WordPress/Tests/PHP/IniSetUnitTest.inc
+++ b/WordPress/Tests/PHP/IniSetUnitTest.inc
@@ -14,8 +14,8 @@ ini_set('short_open_tag', 'On'); // Ok.
 ini_set('short_open_tag', 'on'); // Ok.
 
 ini_set('bcmath.scale', 0); // Error.
-ini_set( 'bcmath.scale' ,0 ); // Error.
-ini_set('display_errors', 0); // Error.
+\ini_SET( 'bcmath.scale' ,0 ); // Error.
+INI_set('display_errors', 0); // Error.
 ini_set('error_reporting', 0); // Error.
 ini_set('filter.default', 'full_special_chars'); // Error.
 ini_set('filter.default_flags', 0); // Error.
@@ -58,3 +58,12 @@ ini_set(
 	// Set the number of decimals.
 	0
 ); // Error.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\ini_set( 'bcmath.scale', 0 ); // Error.
+MyNamespace\ini_alter( 'bcmath.scale', 0 ); // Ok.
+\MyNamespace\ini_set( 'bcmath.scale', 0 ); // Ok.
+namespace\ini_alter( 'bcmath.scale', 0 ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\ini_set( 'bcmath.scale', 0 ); // Ok.
diff --git a/WordPress/Tests/PHP/IniSetUnitTest.php b/WordPress/Tests/PHP/IniSetUnitTest.php
index fede4955b2..1dd5ca4ab7 100644
--- a/WordPress/Tests/PHP/IniSetUnitTest.php
+++ b/WordPress/Tests/PHP/IniSetUnitTest.php
@@ -49,6 +49,7 @@ public function getErrorList() {
 			42 => 1,
 			51 => 1,
 			55 => 1,
+			65 => 1,
 		);
 	}
 
diff --git a/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.inc b/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.inc
index 1942b2b07f..06611613af 100644
--- a/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.inc
+++ b/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.inc
@@ -4,12 +4,21 @@ preg_quote($keywords, '/'); // OK.
 preg_quote( $keywords, '`' ); // OK.
 
 preg_quote($keywords); // Warning.
-$textbody = preg_replace ( "/" . preg_quote($word) . "/", // Warning
+$textbody = preg_replace ( "/" . \PREG_quote($word) . "/", // Warning
                           "<i>" . $word . "</i>",
                           $textbody );
 
 // Safeguard support for PHP 8.0+ named parameters.
 preg_quote(delimiter: '#', str: $keywords); // OK.
 preg_quote(str: $keywords); // Warning.
-preg_quote(str: $keywords, delimitter: '#'); // Warning (typo in param name).
+Preg_QUOTE(str: $keywords, delimitter: '#'); // Warning (typo in param name).
 preg_quote(delimiter: '#'); // OK. Invalid function call, but that's not the concern of this sniff.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\preg_quote($keywords); // Warning.
+MyNamespace\preg_quote($keywords); // Ok.
+\MyNamespace\preg_quote($keywords); // Ok.
+namespace\preg_quote($keywords); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\preg_quote($keywords); // Ok.
diff --git a/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.php b/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.php
index 63d4e0eb9f..4c6a254fae 100644
--- a/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.php
+++ b/WordPress/Tests/PHP/PregQuoteDelimiterUnitTest.php
@@ -40,6 +40,7 @@ public function getWarningList() {
 			7  => 1,
 			13 => 1,
 			14 => 1,
+			20 => 1,
 		);
 	}
 }
diff --git a/WordPress/Tests/PHP/StrictInArrayUnitTest.inc b/WordPress/Tests/PHP/StrictInArrayUnitTest.inc
index fd1e194225..15ce708653 100644
--- a/WordPress/Tests/PHP/StrictInArrayUnitTest.inc
+++ b/WordPress/Tests/PHP/StrictInArrayUnitTest.inc
@@ -3,7 +3,7 @@
 in_array( 1, array( '1', 1, true ), true ); // Ok.
 
 in_array( 1, array( '1', 1, true ) ); // Warning.
-in_array( 1, array( '1', 1, true ), false ); // Warning.
+\In_Array( 1, array( '1', 1, true ), false ); // Warning.
 IN_ARRAY( 1, array( '1', 1, true ), false ); // Warning.
 
 Foo::in_array( 1, array( '1', 1, true ) ); // Ok.
@@ -55,3 +55,12 @@ array_search(
 	$haystack,
 	true // Use strict typing.
 ); // Ok.
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\in_array( 1, array( '1', 2 ) ); // Bad.
+MyNamespace\array_search( 1, array( '1', 2 ) ); // Ok.
+\MyNamespace\array_keys( array( '1', 2 ) ); // Ok.
+namespace\in_array( 1, array( '1', 2 ) ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\array_search( 1, array( '1', 2 ) ); // Ok.
diff --git a/WordPress/Tests/PHP/StrictInArrayUnitTest.php b/WordPress/Tests/PHP/StrictInArrayUnitTest.php
index 41aa9d37c4..d7104d7d9b 100644
--- a/WordPress/Tests/PHP/StrictInArrayUnitTest.php
+++ b/WordPress/Tests/PHP/StrictInArrayUnitTest.php
@@ -52,6 +52,7 @@ public function getWarningList() {
 			44 => 1,
 			48 => 1,
 			49 => 1,
+			62 => 1,
 		);
 	}
 }
diff --git a/WordPress/Tests/Security/PluginMenuSlugUnitTest.inc b/WordPress/Tests/Security/PluginMenuSlugUnitTest.inc
index 2c77ee621e..3f4e34f948 100644
--- a/WordPress/Tests/Security/PluginMenuSlugUnitTest.inc
+++ b/WordPress/Tests/Security/PluginMenuSlugUnitTest.inc
@@ -2,11 +2,11 @@
 
 add_menu_page( $page_title, $menu_title, $capability, __FILE__, $function, $icon_url, $position ); // Bad.
 
-add_dashboard_page( $page_title, $menu_title, $capability, __file__, $function); // Bad.
+\ADD_DASHBOARD_PAGE( $page_title, $menu_title, $capability, __file__, $function); // Bad.
 
 add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, 'awesome-submenu-page', $function ); // Ok.
 
-add_submenu_page( __FILE__ . 'parent', $page_title, $menu_title, $capability, __FILE__, $function ); // Bad x 2.
+Add_Submenu_Page( __FILE__ . 'parent', $page_title, $menu_title, $capability, __FILE__, $function ); // Bad x 2.
 
 // These are all ok: not calling the WP core function.
 $my_class->add_dashboard_page( $page_title, $menu_title, $capability, __FILE__, $function); // Ok.
@@ -20,3 +20,12 @@ add_submenu_page(
 	parent_slug: __FILE__, // Bad.
 	capability: $capability,
 );
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\add_menu_page( $page_title, $menu_title, $capability, __FILE__, $function, $icon_url, $position ); // Bad.
+MyNamespace\add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, __FILE__, $function ); // Ok.
+\MyNamespace\add_dashboard_page( $page_title, $menu_title, $capability, __FILE__, $function ); // Ok.
+namespace\add_menu_page( $page_title, $menu_title, $capability, __FILE__, $function, $icon_url, $position ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, __FILE__, $function ); // Ok.
diff --git a/WordPress/Tests/Security/PluginMenuSlugUnitTest.php b/WordPress/Tests/Security/PluginMenuSlugUnitTest.php
index 6741d048a1..cee8c0e1b6 100644
--- a/WordPress/Tests/Security/PluginMenuSlugUnitTest.php
+++ b/WordPress/Tests/Security/PluginMenuSlugUnitTest.php
@@ -42,6 +42,7 @@ public function getWarningList() {
 			5  => 1,
 			9  => 2,
 			20 => 1,
+			27 => 1,
 		);
 	}
 }
diff --git a/WordPress/Tests/WP/CapabilitiesUnitTest.1.inc b/WordPress/Tests/WP/CapabilitiesUnitTest.1.inc
index ab1fdb9c41..3cd45f9c9c 100644
--- a/WordPress/Tests/WP/CapabilitiesUnitTest.1.inc
+++ b/WordPress/Tests/WP/CapabilitiesUnitTest.1.inc
@@ -63,8 +63,8 @@ add_menu_page( $pagetitle, 'menu_title', 'foo_bar', 'handle', 'function', 'icon_
  * Roles found instead of capabilities.
  */
 add_posts_page( 'page_title', 'menu_title', 'administrator', 'menu_slug', 'function' ); // Error.
-add_media_page( 'page_title', 'menu_title', 'editor', 'menu_slug', 'function' ); // Error.
-add_pages_page( 'page_title', 'menu_title', 'author', 'menu_slug', 'function' ); // Error.
+\aDd_MeDiA_pAgE( 'page_title', 'menu_title', 'editor', 'menu_slug', 'function' ); // Error.
+ADD_PAGES_PAGE( 'page_title', 'menu_title', 'author', 'menu_slug', 'function' ); // Error.
 add_comments_page( 'page_title', 'menu_title', 'contributor', 'menu_slug', 'function' ); // Error.
 add_theme_page( 'page_title', $menu_title, 'subscriber', 'menu_slug', 'function' ); // Error.
 add_plugins_page( 'page_title', 'menu_title', 'super_admin', 'menu_slug', 'function' ); // Error.
@@ -111,8 +111,12 @@ add_menu_page( $p, $t, /* deliberately empty */, $slug, );
 add_menu_page( [] ); // Should bow out because the parameter is not found.
 
 $obj->current_user_can( 'foo_bar' ); // Ok. We're not checking for method calls.
-My\NamespaceS\add_posts_page( 'page_title', 'menu_title', 'administrator', 'menu_slug', 'function' ); // Ok. We're not checking namespaced functions.
 
-// Parse error, should be handled correctly by bowing out.
-// This must be the last test in the file!
-add_posts_page( 'page_title',
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\add_posts_page( 'page_title', 'menu_title', 'administrator', 'menu_slug', 'function' ); // Bad.
+My\NamespaceS\current_user_can( 'administrator' ); // Ok.
+\MyNamespace\add_comments_page( 'page_title', 'menu_title', 'administrator', 'menu_slug', 'function' ); // Ok.
+namespace\author_can( $post, 'administrator' ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\add_posts_page( 'page_title', 'menu_title', 'administrator', 'menu_slug', 'function' ); // Ok.
diff --git a/WordPress/Tests/WP/CapabilitiesUnitTest.5.inc b/WordPress/Tests/WP/CapabilitiesUnitTest.5.inc
new file mode 100644
index 0000000000..d5f8d0d393
--- /dev/null
+++ b/WordPress/Tests/WP/CapabilitiesUnitTest.5.inc
@@ -0,0 +1,8 @@
+<?php
+
+/*
+ * Intentional parse error (nothing after comma separating parameters).
+ * This should be the only test in this file.
+ */
+
+add_posts_page( 'page_title',
diff --git a/WordPress/Tests/WP/CapabilitiesUnitTest.php b/WordPress/Tests/WP/CapabilitiesUnitTest.php
index 42113c2a24..1b4e34dd05 100644
--- a/WordPress/Tests/WP/CapabilitiesUnitTest.php
+++ b/WordPress/Tests/WP/CapabilitiesUnitTest.php
@@ -73,6 +73,7 @@ public function getErrorList( $testFile = '' ) {
 					78  => 1,
 					85  => 1,
 					106 => 1,
+					118 => 1,
 				);
 
 			case 'CapabilitiesUnitTest.3.inc':
diff --git a/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.inc b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.1.inc
similarity index 83%
rename from WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.inc
rename to WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.1.inc
index c2f75c8747..18a26a2b93 100644
--- a/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.inc
+++ b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.1.inc
@@ -3,8 +3,8 @@
 // All will give an ERROR.
 
 get_bloginfo( 'home' );
-get_bloginfo( 'siteurl' );
-get_bloginfo( "text_direction" );
+\GeT_bLoGiNfO( 'siteurl' );
+Get_Bloginfo( "text_direction" );
 echo bloginfo( 'home' );
 echo bloginfo( "siteurl" );
 echo bloginfo( 'text_direction' );
@@ -55,5 +55,11 @@ wp_get_typography_font_size_value( $preset, array() ); // OK.
 wp_get_typography_font_size_value( $preset, true ); // Error.
 wp_get_typography_font_size_value( $preset, false ); // Error.
 
-// Live coding/parse error.
-get_bloginfo( show: /*to do*/, );
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\get_bloginfo( 'home' ); // Bad.
+MyNamespace\register_setting( 'privacy' ); // Ok.
+\MyNamespace\unregister_setting( 'misc' ); // Ok.
+namespace\get_option('blacklist_keys'); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\add_option('comment_whitelist', $value); // Ok.
diff --git a/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.2.inc b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.2.inc
new file mode 100644
index 0000000000..b5923d40e4
--- /dev/null
+++ b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.2.inc
@@ -0,0 +1,8 @@
+<?php
+
+/*
+ * Intentional parse error (empty named parameter).
+ * This should be the only test in this file.
+ */
+
+get_bloginfo( show: /*to do*/, );
diff --git a/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.php b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.php
index c491b12a4d..275191902e 100644
--- a/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.php
+++ b/WordPress/Tests/WP/DeprecatedParameterValuesUnitTest.php
@@ -23,47 +23,64 @@ final class DeprecatedParameterValuesUnitTest extends AbstractSniffUnitTest {
 	/**
 	 * Returns the lines where errors should occur.
 	 *
+	 * @param string $testFile The name of the file being tested.
+	 *
 	 * @return array<int, int> Key is the line number, value is the number of expected errors.
 	 */
-	public function getErrorList() {
-		return array(
-			5  => 1,
-			6  => 1,
-			7  => 1,
-			8  => 1,
-			9  => 1,
-			10 => 1,
-			11 => 1,
-			12 => 1,
-			13 => 1,
-			14 => 1,
-			15 => 1,
-			16 => 1,
-			17 => 1,
-			18 => 1,
-			35 => 1,
-			40 => 1,
-			43 => 1,
-			44 => 1,
-			45 => 1,
-			46 => 1,
-			47 => 1,
-			48 => 1,
-			49 => 1,
-			50 => 1,
-			51 => 1,
-		);
+	public function getErrorList( $testFile = '' ) {
+		switch ( $testFile ) {
+			case 'DeprecatedParameterValuesUnitTest.1.inc':
+				return array(
+					5  => 1,
+					6  => 1,
+					7  => 1,
+					8  => 1,
+					9  => 1,
+					10 => 1,
+					11 => 1,
+					12 => 1,
+					13 => 1,
+					14 => 1,
+					15 => 1,
+					16 => 1,
+					17 => 1,
+					18 => 1,
+					35 => 1,
+					40 => 1,
+					43 => 1,
+					44 => 1,
+					45 => 1,
+					46 => 1,
+					47 => 1,
+					48 => 1,
+					49 => 1,
+					50 => 1,
+					51 => 1,
+					61 => 1,
+				);
+
+			default:
+				return array();
+		}
 	}
 
 	/**
 	 * Returns the lines where warnings should occur.
 	 *
+	 * @param string $testFile The name of the file being tested.
+	 *
 	 * @return array<int, int> Key is the line number, value is the number of expected warnings.
 	 */
-	public function getWarningList() {
-		return array(
-			55 => 1,
-			56 => 1,
-		);
+	public function getWarningList( $testFile = '' ) {
+		switch ( $testFile ) {
+			case 'DeprecatedParameterValuesUnitTest.1.inc':
+				return array(
+					55 => 1,
+					56 => 1,
+				);
+
+			default:
+				return array();
+		}
 	}
 }
diff --git a/WordPress/Tests/WP/DeprecatedParametersUnitTest.inc b/WordPress/Tests/WP/DeprecatedParametersUnitTest.inc
index 1fc0c27b04..9922f8e1e6 100644
--- a/WordPress/Tests/WP/DeprecatedParametersUnitTest.inc
+++ b/WordPress/Tests/WP/DeprecatedParametersUnitTest.inc
@@ -43,8 +43,8 @@ _future_post_hook( 10, $post );
 _load_remote_block_patterns( $value );
 _wp_post_revision_fields( $foo, 'deprecated' );
 add_option( '', '', [] );
-add_option( '', '', 1.23 );
-add_option( '', '', 10 );
+\Add_Option( '', '', 1.23 );
+ADD_OPTION( '', '', 10 );
 add_option( '', '', false );
 add_option( '', '', 'deprecated' );
 comments_link( 'deprecated', 'deprecated' );
@@ -99,3 +99,12 @@ global_terms( $foo, 'deprecated' );
 // All will give an WARNING as they have been deprecated after WP 6.5.
 inject_ignored_hooked_blocks_metadata_attributes('', 'deprecated');
 wp_render_elements_support_styles('deprecated');
+
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\add_option( '', '', [] ); // Bad.
+MyNamespace\get_blog_list( $foo, $bar, 'deprecated' ); // Ok.
+\MyNamespace\get_wp_title_rss( 'deprecated' ); // Ok.
+namespace\the_author( 'deprecated', 'deprecated' ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\wp_title_rss( 'deprecated' ); // Ok.
diff --git a/WordPress/Tests/WP/DeprecatedParametersUnitTest.php b/WordPress/Tests/WP/DeprecatedParametersUnitTest.php
index 3d516ec983..2f8b60510e 100644
--- a/WordPress/Tests/WP/DeprecatedParametersUnitTest.php
+++ b/WordPress/Tests/WP/DeprecatedParametersUnitTest.php
@@ -42,6 +42,9 @@ public function getErrorList() {
 		$errors[50] = 2;
 		$errors[76] = 2;
 
+		// Fully qualified function call.
+		$errors[106] = 1;
+
 		return $errors;
 	}
 
diff --git a/WordPress/Tests/WP/GetMetaSingleUnitTest.inc b/WordPress/Tests/WP/GetMetaSingleUnitTest.inc
index 54ea2fecc0..33aed6468d 100644
--- a/WordPress/Tests/WP/GetMetaSingleUnitTest.inc
+++ b/WordPress/Tests/WP/GetMetaSingleUnitTest.inc
@@ -31,7 +31,7 @@ $incorrect_but_ok = get_metadata( 'post' );
  * These should all be flagged with a warning.
  */
 $warning = \get_post_meta( $post_id, $meta_key );
-implode(', ', get_post_meta( $post_id, $meta_key ));
+implode(', ', \GET_POST_META( $post_id, $meta_key ));
 if (get_post_meta( $post_id, key: $meta_key )) {}
 $warning = get_post_meta( $post_id, key: $meta_key, sinngle: true ); // Typo in parameter name.
 echo get_comment_meta( $comment_id, $meta_key );
@@ -46,3 +46,11 @@ $warning = get_metadata(
 );
 $warning = get_metadata_raw( 'post', $post_id, $meta_key );
 $warning = get_metadata_default( 'post', $post_id, $meta_key );
+
+/*
+ * Safeguard correct handling of fully qualified and relative namespaced function calls (fully qualified global function
+ * call and partially qualified namespaced function call are already handled above).
+ */
+\MyNamespace\get_user_meta( $user_id, $meta_key );
+namespace\get_metadata( 'post', $post_id, $meta_key ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\get_comment_meta( $comment_id, $meta_key );
diff --git a/WordPress/Tests/WP/I18nUnitTest.1.inc b/WordPress/Tests/WP/I18nUnitTest.1.inc
index 6256e6d84a..3abf8ec3ba 100644
--- a/WordPress/Tests/WP/I18nUnitTest.1.inc
+++ b/WordPress/Tests/WP/I18nUnitTest.1.inc
@@ -47,7 +47,7 @@ _n( 'I have %d cat.', 'I have %d cats.', $number, 'my-slug' ); // OK.
 _n( 'I have %d cat.', 'I have %d cats.', $number, "illegal $string" ); // Bad.
 _n( 'I have %d cat.', 'I have %d cats.', $number, SOMETHING ); // Bad.
 
-_n_noop( 'I have %d cat.', 'I have %d cats.' ); // Bad, no text domain.
+_N_NOOP( 'I have %d cat.', 'I have %d cats.' ); // Bad, no text domain.
 _n_noop( 'I have %d cat.', 'I have %d cats.', 'my-slug' ); // OK.
 _n_noop( 'I have %d cat.', 'I have %d cats.', "illegal $string" ); // Bad.
 _n_noop( 'I have %d cat.', 'I have %d cats.',  SOMETHING ); // Bad.
@@ -75,7 +75,7 @@ __( 'foo', 'my-slug', 'too-many-args' ); // Bad.
 _x( 'string', 'context', 'my-slug', 'too-many-args' ); // Bad.
 _n( 'I have %d cat.', 'I have %d cats.', $number, 'my-slug', 'too-many-args' ); // Bad.
 _n_noop( 'I have %d cat.', 'I have %d cats.', 'my-slug', 'too-many-args' ); // Bad.
-_nx_noop( 'I have %d cat.', 'I have %d cats.', 'Not really.', 'my-slug', 'too-many-args' ); // Bad.
+\_Nx_Noop( 'I have %d cat.', 'I have %d cats.', 'Not really.', 'my-slug', 'too-many-args' ); // Bad.
 
 // Make sure that multi-line string literals are accepted.
 _nx( 'I have
@@ -317,4 +317,15 @@ esc_html_e( 'foo', '' ); // Bad: text-domain can not be empty.
 // PHP 8.0+: safeguard handling of newly introduced placeholders.
 __( 'There are %1$h monkeys in the %H', 'my-slug' ); // Bad: multiple arguments should be numbered.
 
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\_( 'foo', 'my-slug' ); // Bad.
+\translate( 'foo', 'my-slug' ); // Bad.
+\translate_with_gettext_context( 'foo', 'bar', 'my-slug' ); // Bad.
+MyNamespace\__( 'foo', 'my-slug' ); // Ok.
+\MyNamespace\_e( 'foo', 'my-slug' ); // Ok.
+namespace\esc_html_e( 'foo', '' ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\translate( 'foo', 'my-slug' ); // Ok.
+
 // phpcs:enable WordPress.WP.I18n.MissingTranslatorsComment
diff --git a/WordPress/Tests/WP/I18nUnitTest.1.inc.fixed b/WordPress/Tests/WP/I18nUnitTest.1.inc.fixed
index b23e9b6192..ae6358abbf 100644
--- a/WordPress/Tests/WP/I18nUnitTest.1.inc.fixed
+++ b/WordPress/Tests/WP/I18nUnitTest.1.inc.fixed
@@ -47,7 +47,7 @@ _n( 'I have %d cat.', 'I have %d cats.', $number, 'my-slug' ); // OK.
 _n( 'I have %d cat.', 'I have %d cats.', $number, "illegal $string" ); // Bad.
 _n( 'I have %d cat.', 'I have %d cats.', $number, SOMETHING ); // Bad.
 
-_n_noop( 'I have %d cat.', 'I have %d cats.' ); // Bad, no text domain.
+_N_NOOP( 'I have %d cat.', 'I have %d cats.' ); // Bad, no text domain.
 _n_noop( 'I have %d cat.', 'I have %d cats.', 'my-slug' ); // OK.
 _n_noop( 'I have %d cat.', 'I have %d cats.', "illegal $string" ); // Bad.
 _n_noop( 'I have %d cat.', 'I have %d cats.',  SOMETHING ); // Bad.
@@ -75,7 +75,7 @@ __( 'foo', 'my-slug', 'too-many-args' ); // Bad.
 _x( 'string', 'context', 'my-slug', 'too-many-args' ); // Bad.
 _n( 'I have %d cat.', 'I have %d cats.', $number, 'my-slug', 'too-many-args' ); // Bad.
 _n_noop( 'I have %d cat.', 'I have %d cats.', 'my-slug', 'too-many-args' ); // Bad.
-_nx_noop( 'I have %d cat.', 'I have %d cats.', 'Not really.', 'my-slug', 'too-many-args' ); // Bad.
+\_Nx_Noop( 'I have %d cat.', 'I have %d cats.', 'Not really.', 'my-slug', 'too-many-args' ); // Bad.
 
 // Make sure that multi-line string literals are accepted.
 _nx( 'I have
@@ -317,4 +317,15 @@ esc_html_e( 'foo', '' ); // Bad: text-domain can not be empty.
 // PHP 8.0+: safeguard handling of newly introduced placeholders.
 __( 'There are %1$h monkeys in the %H', 'my-slug' ); // Bad: multiple arguments should be numbered.
 
+/*
+ * Safeguard correct handling of all types of namespaced function calls.
+ */
+\_( 'foo', 'my-slug' ); // Bad.
+\translate( 'foo', 'my-slug' ); // Bad.
+\translate_with_gettext_context( 'foo', 'bar', 'my-slug' ); // Bad.
+MyNamespace\__( 'foo', 'my-slug' ); // Ok.
+\MyNamespace\_e( 'foo', 'my-slug' ); // Ok.
+namespace\esc_html_e( 'foo', '' ); // The sniff should start flagging this once it can resolve relative namespaces.
+namespace\Sub\translate( 'foo', 'my-slug' ); // Ok.
+
 // phpcs:enable WordPress.WP.I18n.MissingTranslatorsComment
diff --git a/WordPress/Tests/WP/I18nUnitTest.php b/WordPress/Tests/WP/I18nUnitTest.php
index 3834eb189f..20e7accaab 100644
--- a/WordPress/Tests/WP/I18nUnitTest.php
+++ b/WordPress/Tests/WP/I18nUnitTest.php
@@ -148,6 +148,7 @@ public function getErrorList( $testFile = '' ) {
 					311 => 1,
 					315 => 1,
 					318 => 1,
+					323 => 1,
 				);
 
 			case 'I18nUnitTest.2.inc':
@@ -217,6 +218,8 @@ public function getWarningList( $testFile = '' ) {
 					300 => 1,
 					301 => 1,
 					302 => 1,
+					324 => 1,
+					325 => 1,
 				);
 
 			case 'I18nUnitTest.2.inc':