Extract Text from HTTP referer

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I am using the following code to show the referer link any page on my website. How can i modify the code so that it only shows part of the link. i.e if my website url is www.example.com/?s=printing i only want it to extract printing. And this should only happen if the format is www.example.com/?s=aaa and not if the format is anything else like www.example.com/printing.

Code:

<?php 
session_start();
if ( !isset( $_SESSION["origURL"] ) )
$_SESSION["origURL"] = $_SERVER["HTTP_REFERER"]; 
echo $_SESSION["origURL"] 
?>
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2 comments

  1. I figured it out and the following code works:

    <?php 
    session_start();
    if ( !isset( $_SESSION["origURL"] ) )
    $_SESSION["origURL"] = $_SERVER["HTTP_REFERER"]; 
    $mysearchterm = $_SERVER["HTTP_REFERER"]; 
    $whatIWant = substr($mysearchterm, strpos($mysearchterm, "=") +1);    
    echo  $whatIWant;

?>

  2. Values that are send to a page as part of a link are stored by default in the $_GET variable. Your URL is using s=printing. This means the name of the property is s and the value of the property is printing

    Instead of all the string search actions you could use

    if ( isset($_GET['s']) ) $whatIWant = $_GET['s'];

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