WordPress debugging
If WP_DEBUG_LOG is set to true, the error_log-INI setting is set:
ini_set( 'error_log', WP_CONTENT_DIR . '/debug.log' );To write to that file, you can use the error_log-function:
error_log("This message is written to the log file");This function is not specific to WordPress and can be used in any PHP script.
Here's a simple function you can use; it will only log a message if WP_DEBUG is enabled:
function log_me($message) { if ( WP_DEBUG === true ) { if ( is_array($message) || is_object($message) ) { error_log( print_r($message, true) ); } else { error_log( $message ); } }}You can call the log_me() function like this in your theme template(s):
log_me( 'This is a message for debugging purposes' );Which will appear in your /wp-content/debug.log as the following line:
[13-Apr-2013 20:59:17 UTC] This is a message for debugging purposes