What are common issues with variable passing in PHP, as seen in the forum thread?

Common issues with variable passing in PHP include passing variables by value instead of by reference, causing changes made to the variable within a function to not persist outside of the function. To solve this issue, pass variables by reference using the "&" symbol before the variable name in the function parameter list. Example: 

// Incorrect way of passing variables by value
function increment($num) {
    $num++;
}

$number = 5;
increment($number);
echo $number; // Output: 5

// Correct way of passing variables by reference
function increment(&$num) {
    $num++;
}

$number = 5;
increment($number);
echo $number; // Output: 6

Keywords

variable passing PHP pass by reference pass by value scope

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