normalize case of built-in php function

[alexander-akait]

Prettier 1.14.3

PHP Plugin 0.9.0

Input:

$var = MB_STRTOLOWER($class);

Output:

$var = MB_STRTOLOWER($class);

Expected behavior:

$var = mb_strtolower($class);

We can have list of built-in php function and normalize their case (convert to lowercase in many cases), but need discussion.

[alexander-akait]

We can parser their from http://php.net/manual/en/indexes.functions.php, better implement util and add npm command (run this command before each release)