How can variables from one function be passed to another function in PHP?

To pass variables from one function to another in PHP, you can simply return the variable from the first function and then pass it as an argument to the second function when calling it. This allows you to share data between functions without using global variables.

function firstFunction() {
    $variable = "Hello";
    return $variable;
}

function secondFunction($input) {
    echo $input . " World!";
}

$passedVariable = firstFunction();
secondFunction($passedVariable);