php settype（）int总是返回1 [英] php settype() int always returns 1

问题描述

我从 $ _ GET ['category'] 获取变量。这总是应该是一个整数。因此，当我设置我使用的变量时：

I am getting a variable from $_GET['category']. This is always supposed to be a integer. So when I set the variable I use:

$category=settype($_GET['category'], "int");
// Also tried
$category=settype($_GET['category'], "integer");

然而，这总是返回1.它们是查询字符串中的数字，例如：

However, this always returns 1. They are numbers in the query string for example:

http://domain.com/example.php？ category = 57

当我 echo $ category 时，它总是返回1.不管是什么？category = 背后有一个数字。

When I echo $category it always returns 1. No mater what ?category= has behind it for a number.

任何帮助都将不胜感激！谢谢！

Any help would be appreciated! Thank you!

推荐答案

settype 修改变量的类型。您正在使用它，好像它将返回一个新变量。

settype modifies the type of the variable. You're using it as if it would return a new variable.

然而， settype 1 ，因为那是字符串表示的真实。

However, settype returns true if the type change was successful, and false otherwise. You're seeing the result 1 since that's the string representation of true.

你应该使用施放，或 intval ：

$category = (int) $_GET['category']; // or ...
$category = intval($_GET['category']);

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