- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$value = 'http://static.theiconic.com.au/cms/site_updates/Week 42/MSS_1_150x245px.jpghttp://,http://,http://,http://';
$pattern = '/^http:\/\//i';
preg_match_all($pattern, $value, $matches);
var_dump($matches);