1.2.106. Cancelled Parameter

A parameter is cancelled, when its value is hardcoded, and cannot be changed by the calling expression. The argument is in the signature, but it is later hardcoded to a literal value : thus, it is not usable, from the caller point of view.

Reference argument are omitted in this rule, as their value changes, however hardcoded, may have an impact on the calling code.

<?php

function foo($a, $b) {
    // $b is cancelled, and cannot be changed.
    $b = 3;

    // $a is the only parameter here
    return $a + $b;
}

function bar($a, $b) {
    // $b is actually processed
    $c = $b;
    $c = process($c);

    $b = $c;

    // $a is the only parameter here
    return $a + $b;
}

?>

1.2.106.1. Suggestions

• Remove the parameter in the method signature

1.2.106.2. Specs

Short name	Functions/CancelledParameter
Rulesets	All, Analyze, Changed Behavior
Exakat since	2.2.0
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Very high
Available in	Entreprise Edition, Exakat Cloud