[php-src] Issue #19217: array_diff_assoc BUG

Issue: https://github.com/php/php-src/issues/19217 Author: sujrex ### Description The following code: ### on php8.x ```php <?php $array1 = array("111" => ["color" => "green"]); $array2 = array("111" => ["color" => "green"]); $result = array_diff_assoc($array1, $array2); print_r($result); ``` Resulted in this output: ``` Warning: Array to string conversion in script on line 4 Warning: Array to string conversion in script on line 4 Array ( ) ``` But I expected this output instead: ``` Array ( ) ``` ### on php7.4 ```php <?php $array1 = array("111" => ["color" => "green"]); $array2 = array("111" => ["color" => "green"]); $result = array_diff_assoc($array1, $array2); print_r($result); ``` Resulted in this output: ``` Array ( ) ``` 期待结果为：无论那个版本，当比较数组一致时，比较不应该报错，输出位空数组即可 Expect the result to be: no matter which version, when the comparison array is consistent, the comparison should not report an error, and the output bit empty array can be ### PHP Version ```plain PHP 8.x ``` ### Operating System windows or linux