How can the issue of passing parameters by reference be addressed when using call_user_func in PHP?

When using call_user_func in PHP, passing parameters by reference can be problematic because call_user_func does not support passing parameters by reference directly. To address this issue, you can use the concept of variable variables to pass parameters by reference. By creating a variable that holds the parameter value and then passing the variable name to call_user_func, you can effectively pass parameters by reference. 

function increment(&$num) {
    $num++;
}

$number = 5;
$param = 'number';
call_user_func_array('increment', array(&$${$param}));

echo $number; // Output: 6

Keywords

pass by reference call_user_func PHP parameters error

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