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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); } echo "Should pass" . PHP_EOL; var_dump(to_int("0")); var_dump(to_int(0)); var_dump(to_int(0.0)); var_dump(to_int("0.0")); var_dump(to_int("10")); var_dump(to_int(10)); var_dump(to_int(10.0)); var_dump(to_int("10.0")); echo "Should fail" . PHP_EOL; var_dump(to_int(1.5)); var_dump(to_int("1.5")); var_dump(to_int("10abc")); var_dump(to_int("abc10")); var_dump(to_int(INF)); var_dump(to_int(-INF)); var_dump(to_int(NAN)); var_dump(to_int(PHP_INT_MAX * 2)); var_dump(to_int(null)); var_dump(to_int(true)); var_dump(to_int(false)); var_dump(to_int(new stdClass())); var_dump(to_int(fopen("data:text/html,foobar", "r"))); var_dump(to_int([])); /** * 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 ) { // only accept the float if it can be cast to int without data loss $int = (int) $val; if ($int == $val) { return $int; } } } return false; case "string": $val = trim($val, " \t\n\r\v\f"); // trim whitespace $float = filter_var($val, FILTER_VALIDATE_FLOAT); if ($float !== false) { // only accept the float if it can be cast to int without data loss $int = (int) $float; return ($int == $float) ? $int : false; } default: return false; } }
based on CjTPO
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Should pass int(0) int(0) int(0) int(0) int(10) int(10) int(10) int(10) Should fail bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/scYhF on line 39
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/scYhF on line 39
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/scYhF on line 39
Process exited with code 255.