Kolikrát čísel může být tvořen z číslic 12345 php

Příklady kódu

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php zobrazit číslo 4 číslice

echo str_pad( "1", 4, "0", STR_PAD_LEFT );
echo str_pad( "12", 4, "0", STR_PAD_LEFT );
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ověřit počet by měl o 12 místné v php

/^$|^[0-9]{12}$/

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