1.2.1042. Results May Be Missing¶
preg_match() may return empty values, if the search fails. It is important to check for the existence of results before assigning them to another variable, or using it.
Since PHP 7.2, it is possible to use the PREG_UNMATCHED_AS_NULL constant in the flag parameter to avoid this.
<?php
preg_match('/PHP ([0-9\.]+) /', $res, $r);
$s = $r[1];
// $s may end up null if preg_match fails.
?>
1.2.1042.1. Suggestions¶
Use a final always capturing parenthesis to avoid this
Use the
PREG_UNMATCHED_AS_NULLoption (PHP 7.2)
1.2.1042.2. Specs¶
Short name |
Structures/ResultMayBeMissing |
Rulesets |
|
Exakat since |
0.8.4 |
PHP Version |
All |
Severity |
Major |
Time To Fix |
Quick (30 mins) |
Precision |
Very high |
Available in |