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@ 2019-11-09T00:08:50Z

<?php

$count = '1e1';
$count = filter_var($count, FILTER_VALIDATE_INT, ['options' => ['default' => 20, 'min_range' => 1, 'max_range' => 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

67.78 ms | 402 KiB | 5 Q