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FILTER_SANITIZE_NUMBER_INT

Id of this function is 519. By using FILTER_SANITIZE_NUMBER_INT we can remove all chars except digits and + - signs. Here is an example
$str='41!5~6+7'; // Change this value to get different result
$str = filter_var($str,FILTER_SANITIZE_NUMBER_INT);
echo $str;
Output of this is here
4156+7

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