Se ho capito cosa devi estrarre, prova con:
codice:function str_image($img){ preg_match('#img_id=(\d+)&7=(\d+)#', $img, $match); return array( 'img_id' => $match[1], '7' => $match[2], ); } print_r(str_image("<img src=\"/image/image_gallery?img_id=3130048&7=1275387149570\">"));