1.2.328. Declare strict_types Usage

Usage of strict_types. By default, PHP attempts to change the original type to match the type specified by the type-declaration. With an explicit strict_types declaration, PHP ensures that the incoming argument has the exact type.

strict_types were introduced in PHP 7.0.

<?php

// Setting strict_types;
    declare(strict_types = 1);

    function foo(int $i) {
        echo $i;
    }

    // Always valid : displays 1
    foo(1);
    // with strict types, this emits an error
    // without strict types, this displays 1
    foo(1.7);

?>

See also declare.

1.2.328.1. Specs

Short name	Php/DeclareStrictType
Rulesets	All, Appinfo, CE, Changed Behavior, Preferences
Exakat since	0.12.1
PHP Version	With PHP 7.0 and more recent
Severity
Time To Fix
Precision	Very high
Features	declare
Available in	Entreprise Edition, Community Edition, Exakat Cloud