jit_test.php

<?php

ini_set('pcre.jit', 0); 
$t0 = microtime(true);
for ($i = 0; $i < 4000; $i++) {
	preg_match(",$i,", "$i");
}
echo "achieved in " . (microtime(true) - $t0);


ini_set('pcre.jit', 1); 
$r = preg_match('/^(A{1,2}B)+$/', str_repeat('AB',8192)); 

if (false === $r) {
	var_dump($r, "last error: " . preg_last_error());

	ini_set('pcre.jit', 0); 

	$r = preg_match('/^(A{1,2}B)+$/', str_repeat('AB',8192)); 

	echo 'was false' . PHP_EOL;
} 
var_dump($r, "last error: " . preg_last_error());

ini_set('pcre.jit', 0); 
$t0 = microtime(true);
for ($i = 0; $i < 4000; $i++) {
	preg_match(",$i,", "$i");
}
echo "achieved in " . (microtime(true) - $t0);