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run code in 150+ php & hhvm versions
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<?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 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
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