PHP function introduction—urldecode(): Decode URL

PHP function introduction—urldecode(): Decode URL

In developing network applications, you often encounter situations where you need to encode and decode URLs. PHP provides some built-in functions to achieve this function, one of which is the urldecode() function. This article will introduce the usage and sample code of urldecode().

First, let’s understand the concepts of URL encoding and decoding. In the URL, some special characters (such as spaces, slashes, question marks, etc.) are not allowed to appear directly and need to be replaced by some special representations. URL encoding is to convert these special characters into a specific string representation through a specific encoding rule. URL decoding converts these specific string representations back to the original special characters.

The urldecode() function is used to decode URLs. It receives a URL-encoded string as argument and decodes it into the original string. The following is the function prototype of urldecode():

string urldecode ( string $str )

The urldecode() function only accepts one parameter, which is the string that needs to be decoded. It returns the decoded original string.

Next, let’s look at a sample code. Let's say we have a URL parameter that needs to be decoded. First, we can encode this URL parameter through the urlencode() function:

$param = "hello world";
$urlParam = urlencode($param);

The value of the $urlParam variable obtained is "hello world". Next, we can use the urldecode() function to decode the encoded URL parameters:

$decodedParam = urldecode($urlParam);
echo $decodedParam;

When the above code is executed, "hello world" will be output. As you can see, the urldecode() function successfully decodes the encoded URL parameters into the original string.

It should be noted that the urldecode() function is for

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