What are the best practices for ensuring proper variable passing in PHP scripts?

To ensure proper variable passing in PHP scripts, it is important to properly declare and assign values to variables before using them in functions or methods. Additionally, passing variables by reference using the '&' symbol can help prevent unexpected changes to variable values within functions. Lastly, using type declarations in function parameters can help ensure that the correct data types are passed to functions. 

// Proper variable passing in PHP scripts
$variable = "Hello";

function updateVariable(&$var) {
    $var .= " World!";
}

updateVariable($variable);
echo $variable; // Output: Hello World!

Keywords

variable passing PHP scripts data validation type hinting global variables

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