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@ 2014-08-06T08:57:02Z

<?php

$database = 'v23456_1';

if ('' === trim($database) || 'usr' !== substr($database, 0, 3)) {
    throw new InvalidArgumentException(sprintf('The given user name "%s" is invalid.', $database));        
}

Output
Performance
VLD
References
Branches

substr: documentation ( source)
trim: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

39.3 ms | 402 KiB | 5 Q