What are some common pitfalls to avoid when working with arrays in PHP, especially in the context of form submissions?

One common pitfall when working with arrays in PHP, especially in the context of form submissions, is not properly handling array values that are submitted as part of the form data. It's important to check if an array key exists before trying to access its value to avoid potential errors. Another pitfall is not sanitizing and validating array values to prevent security vulnerabilities or unexpected behavior in the application. 

// Example of properly handling array values in form submissions
if(isset($_POST['array_key'])) {
    $array_value = $_POST['array_key'];
    // Sanitize and validate the array value before using it
    $sanitized_value = filter_var($array_value, FILTER_SANITIZE_STRING);
    // Further processing or storing of the sanitized value
}

Keywords

array functions form submissions validation data sanitization error handling

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