InvalidArgumentException()

(PHP 5 >= 5.1.0, PHP 7)

简介

Exception thrown if an argument is not of the expected type.

类摘要

finalpublicException::getMessage(void): string

finalpublicException::getPrevious(void): Throwable

finalpublicException::getCode(void): int

finalpublicException::getFile(void): string

finalpublicException::getLine(void): int

finalpublicException::getTrace(void): array

finalpublicException::getTraceAsString(void): string

publicException::__toString(void): string

finalprivateException::__clone(void): void

In my opinion this exception is invaluable for validating arguments- for example providing strict typing a la C:
<?php
function tripleInteger($int)
{
 if(!is_int($int))
  throw new InvalidArgumentException('tripleInteger function only accepts integers. Input was: '.$int);
 return $int * 3;
}
$x = tripleInteger(4); //$x == 12
$x = tripleInteger(2.5); //exception will be thrown as 2.5 is a float
$x = tripleInteger('foo'); //exception will be thrown as 'foo' is a string
$x = tripleInteger('4'); //exception will throw as '4' is also a string
?>