3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string='produk_kemeja'; $pos=0; $count=0; while(($pos = strpos($string, 'produk_',$pos)) !== FALSE){ $count++; $pos++; if(strpos($string, 'produk_') !== FALSE){ echo $pos; } // This ends } echo $count;

preferences:
42.01 ms | 402 KiB | 5 Q