Adding declare strict_types=1 at the beginning of your PHP files

strict_type_add.sh

#!/bin/bash

add()
{
        sed -i '1 s/<?php/<?php\
declare(strict_types=1);/g' $1

}


for i in $(find $1 -name \*.php);do
        if [ `grep -c "declare(strict_types=1)" $i` == 0 ];then
                add $i
        fi
done