PHP get everything in a string before underscore

Question

I have this code here:

$imagePreFix = substr($fileinfo[\'basename\'], strpos($fileinfo[\'basename\'], \"_\") +1);

this gets me everything after

Answer 1

If you are completely sure that there always be at least one underscore, and you are interested in first one:

$str = $fileinfo['basename'];

$tmp = explode('_', $str);

$res = $tmp[0];

Other way to do this:

$str = "this_is_many_underscores_example";

$matches = array();

preg_match('/^[a-zA-Z0-9]+/', $str, $matches);

print_r($matches[0]); //will produce "this"

(probably regexp pattern will need adjustments, but for purpose of this example it works just fine).