substr.php

<?php
/** 
 * Usage: php -q <file>
 */

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;
$smallStr = 'cd050d70';

require_once './includes/big_string.php';

if($_SERVER['argc'] == 1) {

    $secs = array();
    $results = array();
    
    echo 'Running bench:';
    for($i = 1; $i <= 8; $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':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($smallStr,0,2);
            }

            $return = array( 
                'substr($smallStr,0,2)',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '2':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($smallStr,2,2);
            }

            $return = array( 
                'substr($smallStr,2,2)',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '3':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($smallStr,-2);
            }

            $return = array( 
                'substr($smallStr,-2);',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '4':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($smallStr,-4,2);
            }

            $return = array( 
                'substr($smallStr,-4,2);',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;


        case '5':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($str,0,2);
            }

            $return = array( 
                'substr($bigstr,0,2)',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '6':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($str,2,2);
            }

            $return = array( 
                'substr($bigstr,2,2)',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '7':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($str,-2);
            }

            $return = array( 
                'substr($bigstr,-2);',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

        case '8':
            $buffer = array();
            $m = memory_get_usage();
            $s = microtime(1);

            for($i = 0; $i < $loops; $i++) {
                substr($str,-4,2);
            }

            $return = array( 
                'substr($bigstr,-4,2);',
                (microtime(1)-$s), 
                (memory_get_usage()-$m) 
            );
            echo serialize($return);
            break;

    }
 
    exit;   
}




$php = PHP_VERSION;
$type = gettype($elem);
echo  <<<head

preg benchmark 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";