How can PHP developers efficiently troubleshoot SQL query errors and display relevant error messages?

PHP developers can efficiently troubleshoot SQL query errors by using error handling techniques such as try-catch blocks to catch exceptions thrown by the database connection or query execution. They can also use functions like mysqli_error() or PDO::errorInfo() to retrieve detailed error messages from the database server and display them to the user for debugging purposes. 

<?php

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

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

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

// Execute SQL query
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

// Check for errors
if (!$result) {
    echo "Error: " . $conn->error;
} else {
    // Process query results
    while ($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"] . "<br>";
    }
}

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

?>

Keywords

PHP SQL query errors troubleshooting error messages debugging

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