The InvalidArgumentException class

(PHP 5 >= 5.1.0)

简介

Exception thrown if an argument does not match with the expected value.

类摘要

InvalidArgumentException extends LogicException {

/* 继承的属性 */

protected string $message ;

protected int $code ;

protected string $file ;

protected int $line ;

/* 继承的方法 */

final public string Exception::getMessage ( void )

final public Exception Exception::getPrevious ( void )

final public int Exception::getCode ( void )

final public string Exception::getFile ( void )

final public int Exception::getLine ( void )

final public array Exception::getTrace ( void )

final public string Exception::getTraceAsString ( void )

public string Exception::__toString ( void )

final private void Exception::__clone ( void )

}

用户评论:

Levi Morrison (2011-11-19 09:53:21)

Note that Joey's code showing an example of using InvalidArgumentException uses is_int, but probably should use filter_var($int, FILTER_VALIDATE_INT). Also, whether you should throw this function or OutOfRangeException when dealing with arrays is a bit unclear. My personal preference is to throw InvalidArgumentException.

Joey at anti-culture dot net (2011-02-02 21:08:01)

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 ?>