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switch_vs_if.php
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switch_vs_if.php
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<?php
/**
* Benchmark tests for calling switch vs if constructs
* Usage: php -q switch_vs_if.php
*/
if(!function_exists('memory_get_usage')) {
function memory_get_usage() {
return -1;
}
}
if(PHP_SAPI != 'cli') {
die("Please run this script from command line");
}
$loops = 1000000;
$str='a';
$a='a';
$b='b';
if($_SERVER['argc'] == 1) {
$secs = array();
$results = array();
echo 'Running bench:';
for($i = 1; $i <= 3; $i++) {
$cmd = $_SERVER[_] . ' ' . $_SERVER['SCRIPT_FILENAME'] . ' ' . $i;
$ret = unserialize(`$cmd`);
$secs[] = $ret[1];
$results[] = $ret;
echo '.';
}
echo 'done' . PHP_EOL;
} else {
switch ($_SERVER['argv'][1]) {
case '1':
$m = memory_get_usage();
$s = microtime(1);
for($i = 0; $i < $loops; $i++) {
switch($str){
case $a: $v=$a; break;
case $b: $v=$b; break;
default: $v=$a;
}
}
$return = array(
'switch / case / case / default',
(microtime(1)-$s),
(memory_get_usage()-$m)
);
echo serialize($return);
break;
case '2':
$m = memory_get_usage();
$s = microtime(1);
for($i = 0; $i < $loops; $i++) {
if($str == $a) {
$v = $a;
} else if ($str == $b) {
$v = $b;
} else {
$v = $a;
}
}
$return = array(
'if / else if / else',
(microtime(1)-$s),
(memory_get_usage()-$m)
);
echo serialize($return);
break;
case '3':
$m = memory_get_usage();
$s = microtime(1);
for($i = 0; $i < $loops; $i++) {
$v = $str == $b ? $b : ($str == $a ? $a : $b);
}
$return = array(
'v = s == b ? b : (s == a ? a : b);',
(microtime(1)-$s),
(memory_get_usage()-$m)
);
echo serialize($return);
break;
}
exit;
}
$php = PHP_VERSION;
$type = gettype($elem);
echo <<<head
SWITCH vs. IF tests in PHP v$php
+---------------------------------------------+-------+----------+---------+
| description | sec | memory | % |
+---------------------------------------------+-------+----------+---------+
head;
asort($secs);
$i = 0;
foreach ($secs as $k => $v) {
if($i == 0) {
$best = $results[$k][1];
$results[$k][3] = '100%';
} else {
$results[$k][3] = round(($results[$k][1] * 100) / $best) . '%';
}
echo sprintf(
"| %-43s | %-5s | %-8s | %-7s |\n+%'-45s+%'-7s+%'-10s+%'-9s+\n",
$results[$k][0],
round($results[$k][1],3),
$results[$k][2],
$results[$k][3],
'','','',''
);
$i++;
}
echo "\n\n";