What are the common pitfalls when trying to access non-existent POST variables in PHP scripts?

When trying to access non-existent POST variables in PHP scripts, a common pitfall is not checking if the variable exists before trying to access it. This can lead to undefined variable notices or errors. To solve this issue, you can use the isset() function to check if the POST variable exists before accessing it. 

if(isset($_POST['variable_name'])) {
    $variable = $_POST['variable_name'];
    // Use $variable here
} else {
    // Handle the case when the POST variable is not set
}

Keywords

POST variables PHP scripts isset function error handling undefined index

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