How to Log MySQL Errors in WordPress

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How to Log MySQL Errors in WordPress — Bright Bright Great
MySQL query errors can be difficult to diagnose and correct. For performance reasons, most MySQL installations fail to retain an error log for posterity; inste…
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//-------------------------------------------------
// Database logging - query errors
//
// email database query errors to the contact
// specified
//
// @param n/a
// @return n/a
 
function db_debug_log(){
 
    //WP already stores query errors in this obscure
    //global variable, so we can see what we've ended
    //up with just before shutdown
    global $EZSQL_ERROR;
 
    try {
        //proceed if there were MySQL errors during runtime
        if(is_array($EZSQL_ERROR) && count($EZSQL_ERROR)) {
            //build a log entry
            $xout = array();
 
            //let's start with some environmental information
            $xout[] = "DATE: " . current_time('r');
            $xout[] = "SITE: " . site_url();
            $xout[] = "IP: " . $_SERVER['REMOTE_ADDR'];
            $xout[] = "UA: " . $_SERVER['HTTP_USER_AGENT'];
            $xout[] = "SCRIPT: " . $_SERVER['SCRIPT_NAME'];
            $xout[] = "REQUEST: " . $_SERVER['REQUEST_URI'];
            $xout[] = "\n\n\n\n";
 
            //and lastly, add the error messages with some line separations for readability
            foreach($EZSQL_ERROR AS $e) {
                $xout[] = str_repeat('-', 50) . "\n" . implode("\n", $e) . "\n" . str_repeat('-', 50);
                $xout[] = "\n\n\n\n";
            }
 
            //email it!
            //if a plugin overrides the content-type header for outbound emails, change the message body
            //below to nl2br(esc_html(implode("\n", $xout)))
            wp_mail(get_bloginfo('admin_email'), '[' . get_bloginfo('name') . '] DB Error', implode(“\n”, $xout));
        }
    } catch(Exception $e){ }
 
    return;
}
add_action('shutdown', 'db_debug_log');