WP: console debug

wp-console-debug.php

<?php
/*
Plugin Name: JavaScript Console Debug
Description: Debug your PHP in the console.
Version: 1.0
Author: DRSK
*/

/** 
    // Standard debugging   
        // Simple message to console
        $console->debug("A very simple message");
         
        // Variable to console
        $x = 3;
        $y = 5;
        $z = $x/$y;
        $console->debug("Variable Z: ", $z);
         
        // A warning
        $console->debug("A simple Warning", null, WARN);
         
        // Info
        $console->debug("A simple Info message", null, INFO);
         
        // An error
        $console->debug("A simple error messsage", null, ERROR);
         
        // Array in console
        $fruits = array("banana", "apple", "strawberry", "pineaple");
        $fruits = array_reverse($fruits);
        $console->debug("Fruits array", $fruits);
         
         
        // Object to console
        $book               = new stdClass;
        $book->title        = "Harry Potter and the Prisoner of Azkaban";
        $book->author       = "J. K. Rowling";
        $book->publisher    = "Arthur A. Levine Books";
        $book->amazon_link  = "http://www.amazon.com/dp/0439136369/";
        $console->debug("Object", $book);
        
    // WordPress debugging
    // note: nothing that 'echoes' such as the_permalink() works, use get_permalink() etc instead
        $console->debug($post);
        $console->debug(get_the_id());
        $console->debug("Post name:", $post->post_name);
        $console->debug("Post meta:", get_post_meta( $post->ID ));
*/
 


defined('WP_PLUGIN_URL') or die('Restricted access');

// class to handle the debugging
class WP_console_debug {
    function __construct() {
        // define some variables for the console output
        if (!defined('LOG'))    define('LOG',1);
        if (!defined('INFO'))   define('INFO',2);
        if (!defined('WARN'))   define('WARN',3);
        if (!defined('ERROR'))  define('ERROR',4);
       
        // new line
        define('NL',"\r\n");
        
        // apply debugging to footer
        add_action( 'wp_footer', array( $this, 'print_console' ) );
    }
     
    // debugging to console
    public function debug( $name, $var = null, $type = LOG ) {
        global $console_debug, $wpdb, $template;
        
        if( !$name )
            return;
        
        // debugging template files
        if( $name == TEMPLATE )
            $name = basename( $template );

        // start output
        $output = '<script type="text/javascript">'.NL;
        
        switch($type) {
            case LOG:
                $output .= 'console.log("'.$name.'");'.NL;    
            break;
            case INFO:
                $output .= 'console.info("'.$name.'");'.NL;    
            break;
            case WARN:
                $output .= 'console.warn("'.$name.'");'.NL;    
            break;
            case ERROR:
                $output .= 'console.error("'.$name.'");'.NL;    
            break;
        }
         
        if (!empty($var)) {
            if (is_object($var) || is_array($var)) {
                $object = json_encode($var);
                $output .= 'var object'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' = \''.str_replace( array("'", '\"', '\r\n'), "\'", $object).'\';'.NL;
                $output .= 'var val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' = eval("(" + object'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' + ")" );'.NL;
                switch($type) {
                    case LOG:
                        $output .= 'console.debug(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;    
                    break;
                    case INFO:
                        $output .= 'console.info(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;
                    break;
                    case WARN:
                        $output .= 'console.warn(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;        
                    break;
                    case ERROR:
                        $output .= 'console.error(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;    
                    break;
                }
            } else {
                switch($type) {
                    case LOG:
                        $output .= 'console.debug("'.str_replace('"','\\"',$var).'");'.NL;
                    break;
                    case INFO:
                        $output .= 'console.info("'.str_replace('"','\\"',$var).'");'.NL;
                    break;
                    case WARN:
                        $output .= 'console.warn("'.str_replace('"','\\"',$var).'");'.NL;    
                    break;
                    case ERROR:
                        $output .= 'console.error("'.str_replace('"','\\"',$var).'");'.NL;
                    break;
                }
            }
        }
        
        $output .= '</script>'.NL;
        
        // assign the output to the globally stored variable
        $console_debug = $output;
    }

    // function to print to footer  
    public function print_console() {
        global $console_debug;
        echo $console_debug;
    }

}

// initiation
if( !is_admin() ) {
    $console = new WP_console_debug();
}
  
?>