Question

The standard PHP way to test whether a string $str ends with a substring $test is:

$endsWith = substr( $str, -strlen( $test ) ) == $test 

Is this the fastest way?

Answer 1

What Assaf said is correct. There is a built in function in PHP to do exactly that.

substr_compare($str, $test, strlen($str)-strlen($test), strlen($test)) === 0; 

If $test is longer than $str PHP will give a warning, so you need to check for that first.

function endswith($string, $test) {     $strlen = strlen($string);     $testlen = strlen($test);     if ($testlen > $strlen) return false;     return substr_compare($string, $test, $strlen - $testlen, $testlen) === 0; }