1.2.817. No Null For Index

Avoid using null value as an index in an array. PHP actually cast it to the empty string. This means that later, it might be impossible to find the null in the list of keys.

<?php

$a = [];
$a[null] = 1;

print_r(array_keys($a));
// [''] empty string

?>

1.2.817.1. Suggestions

• Always checks for null values. Given it then a valid value.

1.2.817.2. Specs

Short name	Structures/NoNullForIndex
Rulesets	All, Analyze, Changed Behavior
Exakat since	2.5.3
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Medium
Available in	Entreprise Edition, Exakat Cloud