What are the potential issues with using the global keyword in PHP?

Using the global keyword in PHP can lead to variable scope issues and make code harder to maintain and debug. It is generally considered a bad practice to rely on global variables for sharing data between functions. Instead, it is recommended to use function parameters or return values to pass data between functions. 

// Avoid using global keyword and pass variables as parameters
function add($a, $b) {
    return $a + $b;
}

// Usage
$result = add(5, 3);
echo $result;

Keywords

global keyword variable scope namespace collision code readability alternative solutions

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