PHP Quality Skill

Strict Types Declaration

Every PHP file must begin with declare(strict_types=1). This enforces scalar type coercion rules, catching type errors at call time instead of silently converting values.

<?php

declare(strict_types=1);

// Without strict_types: strlen(123) silently returns 3
// With strict_types: strlen(123) throws TypeError

This is non-negotiable. Omitting it is a code quality defect.

PSR-12 Coding Standard