How can debugging techniques be used to identify errors in PHP scripts, especially when data is not being saved to the database as expected?

When data is not being saved to the database as expected in a PHP script, debugging techniques can be used to identify the errors. One common approach is to check for any syntax errors, ensure that the database connection is established correctly, and verify that the SQL query is properly formatted. Additionally, using functions like error_reporting() and var_dump() can help pinpoint the issue by displaying error messages and variable values. 

<?php

// Enable error reporting to display any syntax errors
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check if the connection is successful
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Sample SQL query to insert data into a table
$sql = "INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')";

// Check if the query is executed successfully
if ($conn->query($sql) === TRUE) {
    echo "Data saved successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// Close the database connection
$conn->close();

?>

Keywords

debugging techniques PHP scripts data database errors

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