minor #51096 Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls (lyrixx)

This PR was merged into the 6.4 branch.

Discussion
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Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Commits
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be1bbbccc1 Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls

Author: nicolas-grekas

Matcher/Dumper/StaticPrefixCollection.php

@@ -147,7 +147,7 @@ private function getCommonPrefix(string $prefix, string $anotherPrefix): array
         $baseLength = \strlen($this->prefix);
         $end = min(\strlen($prefix), \strlen($anotherPrefix));
         $staticLength = null;
-        set_error_handler([__CLASS__, 'handleError']);
+        set_error_handler(self::handleError(...));
 
         try {
             for ($i = $baseLength; $i < $end && $prefix[$i] === $anotherPrefix[$i]; ++$i) {