Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Run Rector on your code to see what it can do for you:

 
 $needle = "";
 $haystack = "asdf";
-if (strpos($haystack, $needle) === false) {
+if (!str_contains($haystack, $needle)) {
     echo "is false";
 }

PHP snippet to change

<?php

$needle = "";
$haystack = "asdf";
if (strpos($haystack, $needle) === false) {
    echo "is false";
}

Applied Rules:

StrContainsRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\Php80\Rector\NotIdentical\StrContainsRector;

return RectorConfig::configure()
    ->withRules([
        StrContainsRector::class
    ]);

Rector version: 9985b9 - released at 2026-09-05 15:05