Question

I’m wondering. Is there a better performance with this:

$value  = preg_replace( array('/_{1,}/', '/-{2,}/'), array('_', '-'), $value);

than this:

$value  = preg_replace('/_{1,}/', '_', $value);
$value  = preg_replace('/-{2,}/', '-', $value);

This is just a very simple example.

Answer 1

As my test code:

$value = 'dfkjgnnfdjgnjnfdkgn dnf gnjknkxvjn jkngjsrgn';
$value1 = 'dfkjgnnfdjgnjnfdkgn dnf gnjknkxvjn jkngjsrgn';

$start = microtime(true);
for ($i = 0; $i < 1000000; $i++)
$value  = preg_replace( array('/_{1,}/', '/-{2,}/'), array('_', '-'), $value);
echo microtime(true) - $start.'<br>';

$start1 = microtime(true);
for ($i = 0; $i < 1000000; $i++){
    $value1  = preg_replace('/_{1,}/', '_', $value1);
    $value1  = preg_replace('/-{2,}/', '-', $value1);
}
echo microtime(true) - $start1;

1.4254899024963

1.2811040878296