1.2.1640. func_get_arg() Modified

func_get_arg() and func_get_args() used to report the calling value of the argument until PHP 7.

Since PHP 7, it is reporting the value of the argument at calling time, which may have been modified by a previous instruction.

This code will display 1 in PHP 7, and 0 in PHP 5.

<?php

function x($a) {
    print func_get_arg(0);  // 0
    $a++;
    print func_get_arg(0);  // 1
}

x(0);
?>

1.2.1640.1. Connex PHP features

1.2.1640.1.1. Suggestions

  • Use func_get_arg() early in the function.

  • Avoir mixing func_get_args() and direct access to the parameters.

  • Avoir using func_get_args() and specifying parameters.

  • Avoir modifying parameters.

1.2.1640.1.2. Specs

Short name

Functions/funcGetArgModified

Rulesets

All, Analyze, Changed Behavior, CompatibilityPHP70

Exakat since

0.8.4

PHP Version

All

Severity

Major

Time To Fix

Quick (30 mins)

Changed Behavior

PHP 7.0

Precision

High

Available in

Entreprise Edition, Exakat Cloud