A simple way to get and judge the source of a submission _php tips

This article describes a simple way to obtain and judge the source of a submission in PHP. Share to everyone for your reference, specific as follows:

echo $_server[' Http_referer '];

This gets the URL of the previous page

For example, you get the following:

$url = http://www.weisuyun.com/nihao.html

Other pages submitted are not accepted
The code is as follows:

if (Strpos ($url, ' http://www.weisuyun.com ')) {
echo ' source is correct ';
} else{
Echo ' source unknown ';
}

The Strpos method returns the first occurrence of the specified string where the specified string is located, without returning false, and the subscript starts at 0

Add:

Stripos () -Find the position where the string first appears in another string (case-insensitive)
Strripos () -Find out where the string last appears in another string (case-insensitive)
Strrpos () -finds the last occurrence of a string in another string (case-sensitive)

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I hope this article will help you with the PHP program design.