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@ 2017-07-11T12:56:05Z

<?php

$number = '+421917982116';
$haveNumberPlus = strpos($number, '+');

if ($haveNumberPlus === false) {
    echo number_format((int)$number, 0, ' ', ' ');
}

echo '+' . number_format((int)$number, 0, ' ', ' ');

Output
Performance
VLD
References
Branches

strpos: documentation ( source)
number_format: documentation ( source)

preferences:dark modelive preview

49.48 ms | 402 KiB | 5 Q