- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$re = '/(?<qty>\d+)x(?<name>[^[]+)\[(?<price>[^]]+)\]=\[(?<subtotal>[^]]+)\]/';
$str = '2xMUA Matte Lipstick - Totally Nude[300]=[600]';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
var_dump($matches);
echo $matches[0]["qty"] . PHP_EOL;
echo $matches[0]["name"] . PHP_EOL;
echo $matches[0]["price"] . PHP_EOL;
echo $matches[0]["subtotal"] . PHP_EOL;