Add PHP as a vulnerable language

[Seldaek]

Based off the JS tests as the languages are very similar. This has also been reported as a security issue to the PHP project (security reports are private so I can't link to it).

[sc0Vu]

@Seldaek is php also vulnerable to early return?

Here is my test script, how do you think?

#!/usr/bin/env php
<?php
$balance= 100;
function substractBalance($amount) {
	/* Subtract funds from bank account then⁧ /*/ return ;
	$balance -= $amount;
}

echo "Starting Balance: " . $balance . PHP_EOL;
substractBalance(50);
echo "After Subtracting 50: " . $balance . PHP_EOL;

[Seldaek]

I guessI'd mark it as ~ per the README, because */ would be more idiomatic. But anyway I don't think this repo is very much maintained so I'll not spend time updating the PR :)