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@ 2019-01-22T09:18:06Z

<?php
$signed_number_strings = ["--1", "---33", "+-444"];

foreach ($signed_number_strings as $string) {
    var_dump((int)preg_replace('~\++|-\+*-~', '', $string));
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

41.68 ms | 402 KiB | 5 Q