Added an assertion for the preg_replace() result

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -3141,11 +3141,15 @@ abstract class AbstractPlatform
      */
     final public function escapeStringForLike(string $inputString, string $escapeChar) : string
     {
-        return preg_replace(
+        $sql = preg_replace(
             '~([' . preg_quote($this->getLikeWildcardCharacters() . $escapeChar, '~') . '])~u',
             addcslashes($escapeChar, '\\') . '$1',
             $inputString
         );
+
+        assert(is_string($sql));
+
+        return $sql;
     }
 
     protected function getLikeWildcardCharacters() : string

phpstan.neon.dist

@@ -19,9 +19,6 @@ parameters:
         # https://github.com/phpstan/phpstan/issues/1847
         - '~^Parameter #2 \$registeredAliases of static method Doctrine\\DBAL\\Query\\QueryException::nonUniqueAlias\(\) expects array<string>, array<int, int|string> given\.\z~'
 
-        # PHPStan is too strict about preg_replace(): https://phpstan.org/r/993dc99f-0d43-4b51-868b-d01f982c1463
-        - '~^Method Doctrine\\DBAL\\Platforms\\AbstractPlatform::escapeStringForLike\(\) should return string but returns string\|null\.\z~'
-
         # legacy remnants from doctrine/common
         - '~^Class Doctrine\\Common\\(Collections\\Collection|Persistence\\Proxy) not found\.\z~'
         - '~^.+ on an unknown class Doctrine\\Common\\(Collections\\Collection|Persistence\\Proxy)\.\z~'