Changing is_null($x) to null === $x or !is_null($x) to null !== $x in PHP

is_null.sh

#!/bin/bash

# Assume we look in tmp

# For is_null
find tmp/ -type f -name "*.php" -exec sed -i -r 's#\([^\!]\)is_null\s*(\([^()]*\))#\1\2 === null#g' {} \;

# For !is_null
find tmp/ -type f -name "*.php" -exec sed -i -r 's#[\!]is_null\s*(\([^()]*\))#\1 !== null#g' {} \;