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@ 2018-04-05T11:20:10Z

<?php

$valueContent = 'p:+40753292522';

                                                $valueContent = preg_replace('/\D+/', '', $valueContent);

                                                if (substr($valueContent, 0, 2) === '31') {
                                                    $valueContent = substr($valueContent, 2);
                                                }

                                                if (substr($valueContent, 0, 1) !== '0') {
                                                    $valueContent = '0' . $valueContent;
                                                }

echo $valueContent;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

55.96 ms | 402 KiB | 5 Q