将php的debug信息与firefox的控制台挂钩

lidonghe

今天学到一个招,就是如果是在FIREFOX或者chrome下,可以将PHP中的警告,错误等信息,
分门别类输出到firebug的控制台中,这样查看起来会比较好看,比较直观.
先有一个debug类如下:

class PHPDebug {
function __construct() {
if (!defined("LOG"))    define("LOG",1);
if (!defined("INFO"))   define("INFO",2);
if (!defined("WARN"))   define("WARN",3);
if (!defined("ERROR"))  define("ERROR",4);
define("NL","\r\n");
echo '<script type="text/javascript">'.NL;
/// this is for IE and other browsers w/o console
echo 'if (!window.console) console = {};';
echo 'console.log = console.log || function(){};';
echo 'console.warn = console.warn || function(){};';
echo 'console.error = console.error || function(){};';
echo 'console.info = console.info || function(){};';
echo 'console.debug = console.debug || function(){};';
echo '</script>';
/// end of IE
}
function debug($name, $var = null, $type = LOG) {
echo '<script type="text/javascript">'.NL;
switch($type) {
case LOG:
echo 'console.log("'.$name.'");'.NL;
break;
case INFO:
echo 'console.info("'.$name.'");'.NL;
break;
case WARN:
echo 'console.warn("'.$name.'");'.NL;
break;
case ERROR:
echo 'console.error("'.$name.'");'.NL;
break;
}
if (!empty($var)) {
if (is_object($var) || is_array($var)) {
$object = json_encode($var);
echo 'var object'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' = \''.str_replace("'","\'",$object).'\';'.NL;
echo 'var val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' = eval("(" + object'.preg_replace('~[^A-Z|0-9]~i',"_",$name).' + ")" );'.NL;
switch($type) {
case LOG:
echo 'console.debug(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;
break;
case INFO:
echo 'console.info(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;
break;
case WARN:
echo 'console.warn(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;
break;
case ERROR:
echo 'console.error(val'.preg_replace('~[^A-Z|0-9]~i',"_",$name).');'.NL;
break;
}
} else {
switch($type) {
case LOG:
echo 'console.debug("'.str_replace('"','\\"',$var).'");'.NL;
break;
case INFO:
echo 'console.info("'.str_replace('"','\\"',$var).'");'.NL;
break;
case WARN:
echo 'console.warn("'.str_replace('"','\\"',$var).'");'.NL;
break;
case ERROR:
echo 'console.error("'.str_replace('"','\\"',$var).'");'.NL;
break;
}
}
}
echo '</script>'.NL;
}
}


  使用起来也很方便,例子如下:

// include and instantiate the class
require_once("PHPDebug.php");
$debug = new PHPDebug();
// simple message to console
$debug->debug("A very simple message");
// vaiable to console
$x = 3;
$y = 5;
$z = $x/$y;
$debug->debug("Variable Z: ", $z);
// a warnign
$debug->debug("A simple Warning", null, WARN);
// info
$debug->debug("A simple Info message", null, INFO);
// An error
$debug->debug("A simple error messsage", null, ERROR);
// Array in console
$fruits = array("banana", "apple", "strawberry", "pineaple");
$fruits = array_reverse($fruits);
$debug->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/";
$debug->debug("Object", $book);


  这样,就可以将各种警告或错误,分门别类地显示在浏览器的控制台中了