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@ 2018-06-01T14:45:18Z

<?php

$nums = [
    '5551234',
    '8045551234',
    '18045551234',
    '0018045551234',
];

foreach ($nums as $num) {
    echo substr($num, -10);
    echo ' ';
    echo substr($num, 0, -10);
    echo PHP_EOL;
    var_dump( substr($num, 0, -10) );
}

Output
Performance
VLD
References
Branches

substr: documentation ( source)
var_dump: documentation ( source)

preferences:dark modelive preview

50.97 ms | 402 KiB | 5 Q