Interpret a human-readable string as a boolean in PHP

stringToBool.php

<?php

/**
 * Convert a human-readable string to a boolean.
 *
 * Case insensitively treats true, t, yes, y, and 1 as true.
 * Anything else is false.
 *
 * @param string $str
 * @return bool
 */
function stringToBool($str)
{
    $str = strtolower((string) $str);

    return in_array(
        $str,
        array(
            'true',
            't',
            'yes',
            'y',
            '1'
        )
    );
}