How can the use of global variables in PHP scripts affect the readability and maintainability of the code, as demonstrated in the example with global declarations for image dimensions and distances?

Using global variables in PHP scripts can make the code harder to read and maintain because it introduces dependencies that may not be immediately apparent. It can also lead to unexpected changes in variable values throughout the script. To improve readability and maintainability, it's better to pass variables explicitly as parameters to functions or use constants instead of global variables. 

<?php
define('IMAGE_WIDTH', 800);
define('IMAGE_HEIGHT', 600);
define('DISTANCE', 50);

function calculateArea($width, $height){
    return $width * $height;
}

$area = calculateArea(IMAGE_WIDTH, IMAGE_HEIGHT);
echo "The area of the image is: " . $area;

?>

Keywords

global variables PHP scripts readability maintainability image dimensions

Related Questions