What are common pitfalls when using the isset function in PHP?

One common pitfall when using the isset function in PHP is that it returns true even if the variable is set to null. To avoid this issue, you can use the strict comparison operator (===) to check if a variable is set and not null. 

// Check if a variable is set and not null using the strict comparison operator
if(isset($variable) && $variable !== null){
    // Variable is set and not null
    echo "Variable is set and not null";
} else {
    // Variable is either not set or null
    echo "Variable is either not set or null";
}

Keywords

isset PHP variable null error

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