- var_dump: documentation ( source)
- filter_var: documentation ( source)
- trim: documentation ( source)
- fopen: documentation ( source)
<?php
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"));
var_dump(to_int("10."));
echo "Should fail" . PHP_EOL;
var_dump(to_int(1.5));
var_dump(to_int("1.5"));
var_dump(to_int("75e-5"));
var_dump(to_int("31e+7"));
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 $val;
case "double":
if ($val === (float) (int) $val) {
return (int) $val;
} else {
return false;
}
case "string":
$val = trim($val, " \t\n\r\v\f"); // trim whitespace
$float = filter_var($val, FILTER_VALIDATE_FLOAT);
return ($float !== false && (int) $val == $float) ? (int) $val : false;
default:
return false;
}
}