PHP code to take Drupal 7's watchdog records and turn them into meaningful messages

Here I use PHP to process the data after retrieving it from the database by querying Drupal's 7 watchdog table. MySQL itself isn't well-suited for decoding and mapping a serialized array like the one in the variables column. Here's how the task can achieved by using PHP:

Step-by-Step Solution

1. Retrieve Data: Query the database, ordering by severity ascending and wid descending.

2. Process the variables Blob: Deserialize the variables column to extract its key-value pairs into an associative array.

3. Replace Placeholders in message: Use PHP's str_replace or preg_replace_callback to replace the %tokens in message with corresponding values from the deserialized array.

4. Output the Result: Print the processed messages in the desired order.

PHP code

<?php
// Database connection
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// Query to fetch data, ordered by severity ASC and wid DESC
$sql = "SELECT message, variables FROM your_table ORDER BY severity ASC, wid DESC";
$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $message = $row['message'];
        $variablesBlob = $row['variables'];
        
        // Convert the serialized blob into an associative array
        $variables = unserialize($variablesBlob);

        // Replace placeholders in the message with actual values
        foreach ($variables as $key => $value) {
            $message = str_replace($key, $value, $message);
        }

        // Output the processed message
        echo "
$message
";
    }
} else {
    echo "No results found.";
}

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

Explanation of the Code

1. Query the Data: The SQL query retrieves the message and variables columns while ordering the results by severity ascending and wid descending.

2. Deserialize the Variables: The unserialize() function converts the variables column (stored as a serialized blob) into an associative PHP array.

3. Replace Placeholders: The str_replace() function is used to map %tokens in message to their corresponding values from the variables array.

4. Display the Result: The processed message is outputted inside a <p> tag for clarity.

Example Output

The output might look like:

Deprecated function: Optional parameter $number declared before required parameter $tooltips is implicitly treated as a required parameter in include_once() (line 1445 of /var/www/html/includes/bootstrap.inc).

This approach is clean, efficient, and uses PHP's strengths to dynamically process the data. Let me know if you'd like further refinements!

 

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