gistfile1.php

<?php

$marks = array();
$times = 100000;

$query = 'INSERT INTO "test";';

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if ((stripos($query, 'INSERT') === 0) || (stripos($query, 'REPLACE') === 0))
	{
	}
}

$end = microtime(true);

$marks['match']['stripos'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(INSERT|REPLACE)~i', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['match']['preg_match'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(?:INSERT|REPLACE)~i', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['match']['preg_match?'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(?:INSERT|REPLACE)~iS', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['match']['preg_match?S'] = round($end - $start, 4);

$query = 'SELECT * FROM "test";';

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if ((stripos($query, 'INSERT') === 0) || (stripos($query, 'REPLACE') === 0))
	{
	}
}

$end = microtime(true);

$marks['no-match']['stripos'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(INSERT|REPLACE)~i', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['no-match']['preg_match'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(?:INSERT|REPLACE)~i', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['no-match']['preg_match?'] = round($end - $start, 4);

$start = microtime(true);

for ($i = 0; $i < $times; $i++)
{
	if (preg_match('~^(?:INSERT|REPLACE)~iS', $query) === 1)
	{
	}
}

$end = microtime(true);

$marks['no-match']['preg_match?S'] = round($end - $start, 4);

echo '<pre>';
print_r($marks);
echo '</pre>';

?>