In PHP, what are some common methods for error handling and displaying error messages to users when form data is not selected or submitted correctly?

When handling errors in PHP for form data not being selected or submitted correctly, common methods include using conditional statements to check for errors, setting error messages, and displaying them to the user. One approach is to use PHP's built-in functions like isset() or empty() to validate form data and show error messages if necessary. 

<?php
// Check if form data is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Check if form fields are empty
    if (empty($_POST['field_name'])) {
        $error_message = "Field is required";
    }

    // Display error message if exists
    if (isset($error_message)) {
        echo $error_message;
    } else {
        // Process form data
    }
}
?>

Keywords

try-catch error_reporting error_log trigger_error exception handling

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