Online PHP editor | output for csomf

@ 2014-10-08T13:59:27Z

<?php

// conditionally define PHP_INT_MIN since PHP 5.x doesn't
// include it and it's needed to validate integer casts
if (!defined("PHP_INT_MIN")) {
    define("PHP_INT_MIN", ~PHP_INT_MAX);
}

var_dump(to_int(PHP_INT_MAX) === PHP_INT_MAX);

/**
 * Returns the value as an int, or false if it cannot be safely cast
 * @param mixed $val
 * @return int
 */
function to_int($val)
{
    switch (gettype($val)) {
        case "integer":
            return $val;
        case "double":
            if (!is_infinite($val) && !is_nan($val) && $val >= PHP_INT_MIN) {
                // due to rounding issues, on 64-bit platforms
                // the float must be less than PHP_INT_MAX

                if (
                    (PHP_INT_SIZE === 8 && $val < PHP_INT_MAX) || // valid 64-bit
                    (PHP_INT_SIZE !== 8 && $val <= PHP_INT_MAX) // valid non-64-bit
                ) {
                    return (int) $val; // valid floats should cast
                }
            }

            return false;
        case "string":
            $val = trim($val, " \t\n\r\v\f"); // trim whitespace
            return filter_var($val, FILTER_VALIDATE_INT);
        default:
            return false;
    }
}

Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: bool(true)
Output for 5.0.0 - 5.0.4: Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 6 Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 9 Fatal error: Call to undefined function filter_var() in /in/csomf on line 37
Process exited with code 255.
Output for 4.3.2 - 4.3.11: Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 6 Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 9 Fatal error: Call to undefined function: filter_var() in /in/csomf on line 37
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 6 Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/csomf on line 9 Fatal error: Call to undefined function: filter_var() in /in/csomf on line 37

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