PHP中strtr与str_replace函数运行性能简单测试示例

?php
require_once('Timer.php');
$target = 'qwertyuiop[]asdfghjkl;\'zxcvbnm,./qwertyuiop[]asdfghjkl;'zxcvbnm,./qwertyuiop[]asdfghjkl;\'zxcvbnm,./qwertyuiop[]asdfghjkl;'zxcvbnm,./qwertyuiop[]asdfghjkl;\'zxcvbnm,./qwertyuiop[]asdfghjkl;'zxcvbnm,./qwertyuiop[]asdfghjkl;\'zxcvbnm,./qwertyuiop[]asdfghjkl;'zxcvbnm,./qwertyuiop[]asdfghjkl;\'zxcvbnm,./qwertyuiop[]asdfghjkl;'zxcvbnm,./';
$count = isset($argv[1]) ? (int)$argv[1] : 1;
$needle = 'vb';
Timer::getInstance()->begin();
for($i = 0; $i  $count; $i++) {
 strtr($target, $needle, '*');
}
echo "strtr exec {$count} times used time: " . Timer::getInstance()->end()->gone() . " sec.\n";
//----------------------------------------------------------------------------------------------
Timer::getInstance()->begin();
for($i = 0; $i  $count; $i++) {
 str_replace($needle, '*', $target);
}
echo "str_replace exec {$count} times used time: " . Timer::getInstance()->end()->gone() . " sec.\n";