[fix]: php code sometimes gets mangled

[dannydulai]

<img src='<?php echo $foo["bar"] ?>'>
<img src='<?php echo isset($foo['bar']) ? $foo['bar'] : ""; ?>'>

gets turned into:

<img src="<?php echo $foo[&quot;bar&quot;] ?>">
<img src="<?php echo isset($foo[" bar'])="" ?="" $foo['bar']="" :="" "";="">'>

I also have:

        directives: [
            { name: '?php', start: '<', end: '>' }
        ]

in my posthtml options

[Scrum]

@dannydulai Hi, thanks for the find, I will try to deal with this problem