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@ 2019-11-09T00:05:52Z

<?php

$count = '30';
$count = filter_var($count, FILTER_VALIDATE_INT, ['default' => 20, 'min' => 1, 'max' => 20]);

if (!$count) {
    $count = 20;
}

var_dump($count);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
filter_var: documentation ( source)

preferences:dark modelive preview

36.89 ms | 402 KiB | 5 Q