- explode: documentation ( source)
<?php
$data = "[orderId] => 212939129;
[orderId] => 212939129
[orderNumber] => INV10001
[salesTax] => 1.00
[amount] => 21.00
[terminal] => 5
[currency] => 1
[type] => purchase
[avsStreet] => 123 Road
[avsZip] => A1A 2B2
[customerCode] => CST1001
[cardId] => 18951828182
[cardHolderName] => John Smith
[cardNumber] => 5454545454545454
[cardExpiry] => 1025
[cardCVV] => 100";
$butt = explode(" => ", $data);
for ($i = 0; $i < count($butt); $i++) {
if ($butt[$i] === "[salesTax]") {
echo $butt[$i+1];
}
}
?>