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@ 2017-01-23T11:18:08Z

<?php
function cele_cislo($cislo)    {
    return preg_match('/^[1-9]\d*$/', $cislo) === 1;
}

var_dump(cele_cislo('123456f'));
var_dump(cele_cislo('f123456'));
var_dump(cele_cislo('123456'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

36.01 ms | 405 KiB | 5 Q