What are common mistakes when passing variables between PHP files using GET and POST methods?

Common mistakes when passing variables between PHP files using GET and POST methods include not properly sanitizing user input, not checking if the variable is set before using it, and not using the correct method to retrieve the variable (e.g., using $_GET instead of $_POST). To solve this issue, always validate and sanitize user input, check if the variable is set before using it, and use the appropriate method to retrieve the variable. 

// Example of passing variables between PHP files using GET method
// Sender file
$variable = "example";
echo "<a href='receiver.php?var=" . urlencode($variable) . "'>Click here</a>";

// Receiver file (receiver.php)
if(isset($_GET['var'])){
    $received_variable = $_GET['var'];
    echo "Received variable: " . $received_variable;
} else {
    echo "Variable not set";
}

Keywords

GET method POST method variable passing PHP files mistakes

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