How can global variables impact the performance and security of PHP scripts, especially when handling user input?

Global variables can impact the performance and security of PHP scripts by making it easier for malicious users to manipulate data and potentially exploit vulnerabilities. To mitigate these risks, it's recommended to avoid using global variables, especially when handling user input. Instead, use superglobal arrays like $_POST, $_GET, or $_SESSION to securely handle user input and prevent security vulnerabilities. 

// Avoid using global variables and use superglobal arrays to handle user input securely
$userInput = $_POST['user_input'];
// Process the user input securely

Keywords

global variables performance security PHP scripts user input

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