1.2.259. 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);
}
?>
1.2.259.1. Suggestions¶
Add null typehint to the code (PHP 8.0+).
Add ? typehint to the code.
1.2.259.2. 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 |
Features |
null, typehint, nullable |
Available in |