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PHP FILTER_VALIDATE_BOOLEAN Filter

< Complete PHP Filter Reference

Definition and Usage

The FILTER_VALIDATE_BOOLEAN filter validates value as a boolean option.

Name: "boolean"
ID-number: 258

Possible return values:

Returns TRUE for "1", "true", "on" and "yes"
Returns FALSE for "0", "false", "off" and "no"
Returns NULL otherwise.

Example

<?php
$var="yes";

var_dump(filter_var($var, FILTER_VALIDATE_BOOLEAN));
?>

The output of the code will be:

bool(true)

< Complete PHP Filter Reference