Fix warning on null query parameter (php-debugbar#722)

* Check if hljs has language (php-debugbar#699)

* Fix PHP 8 warning in `TracedStatement::getSqlWithParameters()` when null was bound

Since PHP 8.0, [built-in functions like `strtr()` will emit a warning when passing `null` to required string parameters](docs):

```
strtr(): Passing null to parameter php-debugbar#1 ($string) of type string is deprecated
```

This can happen when e.g. binding `PDO::PARAM_NULL` to your query.

[docs]: https://www.php.net/manual/en/migration81.deprecated.php#migration81.deprecated.core.null-not-nullable-internal

---------

Co-authored-by: Barry vd. Heuvel <[email protected]>

Author: UrGuardian4ngel

src/DebugBar/DataCollector/PDO/TracedStatement.php

@@ -114,9 +114,12 @@ public function getSqlWithParams(string $quotationChar = '<>') : string
 
         foreach ($this->parameters as $k => $v) {
 
-            $backRefSafeV = strtr($v, $cleanBackRefCharMap);
-
-            $v = "$quoteLeft$backRefSafeV$quoteRight";
+            if (null === $v) {
+                $v = 'NULL';
+            } else {
+                $backRefSafeV = strtr($v, $cleanBackRefCharMap);
+                $v = "$quoteLeft$backRefSafeV$quoteRight";
+            }
 
             if (is_numeric($k)) {
                 $marker = "\?";

tests/DebugBar/Tests/TracedStatementTest.php

@@ -119,6 +119,37 @@ public function testReplacementParamsContainingPotentialAdditionalNamedPlacehold
         $this->assertEquals($expected, $result);
     }
 
+    /**
+     * Check if literal `NULL` query parameters are replaced without triggering a deprecation warning since PHP 8.0.0.
+     * This can happen when e.g. binding `PDO::PARAM_NULL` to your prepared statement.
+     *
+     * @link https://www.php.net/manual/en/migration81.deprecated.php#migration81.deprecated.core.null-not-nullable-internal
+     */
+    public function testReplacementParamsContainingLiteralNullValueGeneratesCorrectString()
+    {
+        $sql = 'UPDATE user SET login_failed_reason = :nullable_reason WHERE id = :id';
+
+        $params = [
+            'id' => 1234,
+            'nullable_reason' => 'Life happens',
+        ];
+
+        $traced = new TracedStatement($sql, $params);
+        $expected = 'UPDATE user SET login_failed_reason = "Life happens" WHERE id = "1234"';
+        $result = $traced->getSqlWithParams('"');
+        $this->assertEquals($expected, $result);
+
+        $params = [
+            'id' => 1234,
+            'nullable_reason' => null,
+        ];
+
+        $traced = new TracedStatement($sql, $params);
+        $expected = 'UPDATE user SET login_failed_reason = NULL WHERE id = "1234"';
+        $result = $traced->getSqlWithParams('"');
+        $this->assertEquals($expected, $result);
+    }
+
     /**
      * Check if query parameters are being replaced in the correct way
      * @bugFix Before fix it : select *