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es nepārbaudītu vai $id ir skaitlis, es viņu vienkārši par tādu pataisītu:

$id = (int)$_GET['id'];

Viss, kas nav pārtaisāms par veselu skaitli, būs 0.

Un meklējot rakstu ar 0 - nekas netiks atrasts, un tas būtu arī vēlamais scenārijs.

Tad if'ā tev būtu tikai jāpārbauda, vai $cat ir valīda kategorija.

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