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<?php $string = '<img src="/index.php/tools/packages/bullseye/file_display.php?htmlpage=&mp;fID=3200" /><img src="/index.php/tools/packages/bullseye/file_display.php?htmlpage=&mp;fID=300" /><img src="/index.php/tools/packages/bullseye/file_display.php?htmlpage=&mp;fID=300" />'; $file_ids = array(); $html = preg_match_all('~src="/index\.php/tools/packages/bullseye/file_display\.php\?htmlpage=&fID=(\d+)"~', $string, $file_ids); $file_ids = array_unique(array_map(function($v) { return intval($v); }, (array)$file_ids[1])); var_dump($file_ids);