What are common pitfalls when using the empty() function in PHP, especially when passing functions as parameters?

When using the empty() function in PHP, one common pitfall is that it cannot be directly used with functions as parameters. To avoid this issue, you should assign the function result to a variable and then check if that variable is empty. This ensures that the function is called only once and its result is properly evaluated. 

// Incorrect usage of empty() with a function as a parameter
if (empty(getData())) {
    // Do something
}

// Correct way to handle functions as parameters with empty()
$data = getData();
if (empty($data)) {
    // Do something
}

Keywords

empty function parameters PHP pitfalls

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