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@ 2016-06-20T14:53:07Z

<?php
$str = 'a1b2c3 abc123';

$part = explode(' ', $str);
$reverted = strrev($part[1]);
if ($part[0] === $reverted) {
    echo 'YES';
} else {
    echo 'NO';
}

Output
Performance
VLD
References
Branches

explode: documentation ( source)
strrev: documentation ( source)

preferences:dark modelive preview

54.81 ms | 402 KiB | 5 Q