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What are the drawbacks of using a high number of global variables in PHP code?

Having a high number of global variables in PHP code can lead to potential naming conflicts, difficulty in tracking variable changes, and decreased code readability. To solve this issue, it is recommended to limit the use of global variables and instead use more localized variables within functions or classes.

php 
// Avoid using global variables by passing variables as parameters to functions or methods
function calculateSum($num1, $num2) {
    return $num1 + $num2;
}

$number1 = 5;
$number2 = 10;

$result = calculateSum($number1, $number2);
echo $result; // Output: 15

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