apache - $_GET in PHP not getting utm values

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apache - $_GET in PHP not getting utm values

posted Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

apache - $_GET in PHP not getting utm values

I am trying to print / echo utm_source, utm_medium and utm_campaign query values using this PHP code;

echo $_GET['utm_source'];

But strangely for some unknown reason on my server its not printing the values, when I replace utm_source to something else like test_source I am able to see the value in print.

Never faced any such issue, can anyone guide me here.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<?php echo $_GET['utm_source']; ?>

</body>
</html>

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1 Reply

深蓝 · Answer 1 · 2022-01-31T07:23:40+0000

Your original question quoted this code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<?php $_GET['utm_source']; ?>

</body>
</html>

If you add an echo to this statement it will work

<?php echo $_GET['utm_source']; ?>

when tested using

test.com/test.php?utm_source=1

A safer piece of PHP code would be

<?php 
    if ( isset($_GET['utm_source']) ) {
        echo $_GET['utm_source']; 
    } else {
        echo 'the parameter utm_source is missing';
    }
?>

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