- var_dump: documentation ( source)
- filter_var: documentation ( source)
- trim: documentation ( source)
<?php
var_dump(to_int('1..5'));
var_dump(to_int('1...'));
/**
* 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;
}
}