What is the best practice for passing variables from outside a function to inside in PHP?

When passing variables from outside a function to inside in PHP, the best practice is to use function parameters. By defining parameters in the function declaration, you can pass variables from outside the function when calling it. This ensures that the function is reusable and can accept different values each time it is called. 

// Define a function with parameters to pass variables from outside
function myFunction($variable1, $variable2) {
    // Use the passed variables inside the function
    echo "Variable 1: " . $variable1 . "<br>";
    echo "Variable 2: " . $variable2 . "<br>";
}

// Call the function and pass variables from outside
$var1 = "Hello";
$var2 = "World";
myFunction($var1, $var2);

Keywords

variable scope global keyword superglobals function parameters pass by reference

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