How can PHP developers troubleshoot issues when SQL joins are not working as expected in their PHP application?

When SQL joins are not working as expected in a PHP application, developers can troubleshoot the issue by checking the join conditions, ensuring that the tables being joined have the necessary relationships, and verifying that the SQL query syntax is correct. They can also use tools like var_dump() or print_r() to inspect the result set and debug any errors. 

// Example of troubleshooting SQL join issues in PHP
$sql = "SELECT * FROM table1 JOIN table2 ON table1.id = table2.table1_id";
$result = mysqli_query($conn, $sql);

if (!$result) {
    echo "Error: " . mysqli_error($conn);
} else {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process the result set
    }
}

Keywords

PHP SQL joins troubleshooting debugging error handling

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