How can the error message "Strict Standards: Only variables should be passed by reference" be resolved in PHP?

The error message "Strict Standards: Only variables should be passed by reference" occurs when a function is expecting a variable to be passed by reference, but a non-variable (such as a value or an expression) is passed instead. To resolve this issue, you should ensure that only variables are passed by reference to functions that require it. 

// Incorrect usage that triggers the error
function increment(&$num) {
    $num++;
}

$value = 5;
increment(5); // This will trigger the error

// Corrected code
$number = 5;
increment($number); // This will not trigger the error

Keywords

PHP Strict Standards Variables Reference Error Message

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