What could be causing the issue of GET parameters returning unexpected values in PHP code?

The issue of GET parameters returning unexpected values in PHP code could be caused by improper encoding or manipulation of the parameters. To solve this issue, make sure to properly sanitize and validate the input data before using it in your code. 

// Sanitize and validate the GET parameter before using it
$param = isset($_GET['param']) ? filter_var($_GET['param'], FILTER_SANITIZE_STRING) : '';

// Now you can safely use the sanitized parameter in your code
echo $param;

Keywords

GET parameters PHP code unexpected values data sanitization URL encoding

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