getting number from the variable

[osusano]

hello there i have a variable like this

$test = 'ABC2345';

i want to get those numbers without using the substr function coz those number are not the same always so bascially i want to segregate the alphabets from numeric.. is theres any function that will get this?

ty

[PHPThorsten]

/* Get only Numeric Values */
$test = preg_replace("/[^0-9]/", "", $test);