How to determine the origin and jump in php

php method to determine the origin and jump: first create a PHP sample file; then implement the judgment logic through if statements and strpos and other functions; finally run the file to determine the origin link and make the corresponding jump change.

php determines the source and jumps

<?php 
    if(strpos($_SERVER[&#39;HTTP_REFERER&#39;],&#39;baidu.com&#39;)===false){
        //不是从百度过来的
        header(&#39;Location: http://www.c.com/somepage.php&#39;);
    }
?>

Related introduction:

strpos( ) function finds the first occurrence of a string within another string.

Note: The strpos() function is case-sensitive.

Note: This function is binary safe.

Related functions:

stripos() - Find the first occurrence of a string in another string (not case sensitive)

strripos() - Find the last occurrence of a string in another string (case-insensitive)

strrpos() - Find the last occurrence of a string in another string (case-sensitive)

Syntax

strpos(string,find,start)

Parameters

string Required. Specifies the string to search for.

find Required. Specifies the string to search for.

start Optional. Specifies where to start the search.

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