What are potential pitfalls when using isset() and !empty() functions in PHP?

When using isset() and !empty() functions in PHP, a potential pitfall is that isset() only checks if a variable is set and not null, while !empty() also checks if a variable is not empty (i.e., not an empty string, zero, false, null, or an empty array). To avoid unexpected behavior, it's important to use !empty() when checking if a variable is both set and not empty. 

// Potential pitfall: using isset() alone may not cover all cases
if (isset($variable) && !empty($variable)) {
    // Do something with $variable
}

Keywords

isset !empty PHP null undefined

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