Php – Find Assignation in Condition using a Regex

I need a regex with which I could find if there is any assignation inside conditions.

I will use this regex on .php files to find mistakes such as :

<?php
if($foo = "bar") { // instead of $foo == "bar"
    //...
}

I found a question similar to mine that helped me resolve this problem with this regex :

/ifs*(.+[^!=<>]=[^=]/

However, it also matches where there is an ‘=’ inside a string which is not what I wanted :

<?php
if($foo != '=') {
    //...
}

Note that it should also work on complex conditions with many comparisons such as :

if($foo == 0 && ($bar == 1 || $fooBar = 1) { // Instead of $fooBar == 1
    // ...
}

It is quite a challenging regex to find, and I would be very gratefull if I could get some help !