1.2.260. Could Be Null

Mark arguments, properties, class constants and return types that can be null. Null was introduced as a standlone type in PHP 8.2. Before that, null had to be paired with another type.

<?php

// Accept null as input, when used as third argument of file_get_contents
function foo($b) {
    $s = file_get_contents(URL, false, $b);

    // Returns a string
    return shell_exec($s);
}

?>

1.2.260.1. Connex PHP features

• null

• typehint

• nullable

1.2.260.1.1. Suggestions

• Add null typehint to the code (PHP 8.0+).

• Add ? typehint to the code.

1.2.260.1.2. Specs

Short name	Typehints/CouldBeNull
Rulesets	All, CE, Typechecks
Exakat since	2.1.2
PHP Version	All
Severity	Major
Time To Fix	Quick (30 mins)
Precision	High
Available in	Entreprise Edition, Community Edition, Exakat Cloud