How can the issue of undefined variables and constants in PHP scripts be resolved to improve code quality?

To resolve the issue of undefined variables and constants in PHP scripts, it is important to initialize variables before using them and define constants before referencing them in the code. This can help improve code quality by preventing errors and ensuring that all variables and constants are properly declared. 

<?php

// Define constants
define('PI', 3.14);

// Initialize variables
$name = "John";
$age = 30;

// Code using the variables and constants
echo "Hello, my name is " . $name . " and I am " . $age . " years old.";
echo "The value of PI is: " . PI;

?>

Keywords

undefined variables undefined constants error_reporting isset function define function

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