What are some common debugging techniques for resolving PHP script issues related to URL parameters?

When debugging PHP script issues related to URL parameters, a common technique is to use the $_GET superglobal array to access and manipulate the parameters passed in the URL. You can use functions like isset() to check if a parameter is set, and htmlspecialchars() to sanitize user input to prevent security vulnerabilities. 

// Check if a parameter named 'id' is passed in the URL
if(isset($_GET['id'])) {
    $id = htmlspecialchars($_GET['id']);
    // Use the $id variable in your script
} else {
    echo "No ID parameter provided";
}

Keywords

Xdebug var_dump error_reporting $_GET $_POST

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