Her er et simpelt debug script

Der findes flere metoder til at debugge et php script.
Men er man på et webhotel er det ikke altid lige nemt at installere nødvendige programmer.

Med dump.php kan man hurtig se variabler og deres værdi.

<?php
function dump()
{
	$dump_body_background =  "navy";
	$dump_body_font_color = "yellow";
	$dump_body_border = "2px";
	$dump_body_border_color = "red";
	$dump_body_border_type = "solid";
	$dump_body_border_padding = "5px";
	$top_legend_background_color = "lightgrey";
	$info_legend_background_color = "lightgrey";
	$top_legend_padding = "5px";
	$show_info_background = "lightgrey";
	$show_info_font = "blue";
	$show_info_padding = "5px";
	$top_legend_font_color = "blue";
	$show_info = 1; // 0 = ingen info

	//	$fil = "File";
        //	$line = "line";
	//	$variable_name = "Variable name";
	//	$variable_type = "Variable type";
	//	$of = "of";

	$fil = "Fil";
	$line = "linje";
	$variable_name = "Variabel navn";
	$variable_type = "Variabel type";
	$of = "af";

	if(!function_exists('_dump_type'))
	{
		function _dump_type($value)
		{
			$type = "";

			if(is_int($value)) $type = 'integer';

			if(is_null($value)) $type = 'null';

			if(is_string($value)) $type = 'string';

			if(is_float($value)) $type = 'float';

			if(is_bool($value)) $type = 'boolean';

			if(is_array($value)) $type = 'array';

			if(is_object($value)) $type = 'object';

			return $type;
		}
	}

	if(!function_exists('_d_'))
	{
		function _d_($value,$level=0)
		{
			if ($level==-1)
			{
				$trans["\t"]='⇒';
				$trans["\n"]='¶;';
				$trans["\r"]='↵';
				$trans["\0"]='⊕';
				return strtr(htmlspecialchars($value),$trans);
			}

			if ($level==0)
			echo '<pre>';

			$type = _dump_type($value);

			if ($type == 'string')
			{
				$value= _d_($value,-1);
			}

			elseif ($type == 'boolean')
			{
				$value = ($value?'true':'false');
			}
			elseif ($type == 'object')
			{
				$props= get_class_vars(get_class($value));
				echo $type.' ('.count($props).') <u>'.get_class($value).'</u>';
				foreach($props as $key=>$val)
				{
					echo "\n".str_repeat("\t",$level+1).$key.' => ';
					_d_($value->$key,$level+1);
				}

				$value= '';
			}
			elseif ($type=='array')
			{
				echo $type.' ('.count($value).')';
				foreach($value as $key=>$val)
				{
					echo "\n".str_repeat("\t",$level+1)._d_($key,-1).' => ';
					_d_($val,$level+1);
				}

				$value= '';
			}

			echo '<strong>'.$value.'</strong>';

			if ($level==0) echo '</pre>';
		}
	}

	list($debug_list) = debug_backtrace();
	$arguments = func_get_args();
	$total_arguments = count($arguments);

	$source = file($debug_list['file']);
	echo '<fieldset style="background:'.$dump_body_background.'; color: '.$dump_body_font_color.';  !important; border:'.$dump_body_border.' '.$dump_body_border_color.' '.$dump_body_border_type.'; padding:'.$dump_body_border_padding.'">';
	echo '<legend style="background:'.$top_legend_background_color.'; color:'.$top_legend_font_color.'; padding:'.$top_legend_padding.';">'.$fil.': '.$_SERVER['HTTP_HOST'].$debug_list['file'].' @ '.$line.': '.$debug_list['line'].'</legend><pre>';
	if ($show_info >= 1)
	{
		echo '<fieldset style="background:'.$show_info_background.'; color:'.$show_info_font.'; padding:'.$show_info_padding.';">';
		echo '⇒ <b>=> tab (\t)</b>  	¶ <b>=> new line (\n)</b>  	↵; <b>=> carrige retun (\r)</b>   ⊕ <b>=>  (\0)</fieldset></b>';
	}

	$i = 0;
	foreach ($arguments as $argument)
	{
		$tmp = explode("(",$source[$debug_list['line']-1]);
		$tmp = explode(")",$tmp[1]);
		$var_names = explode(",",$tmp[0]);
		$type = _dump_type($argument);

		if ($type == 'string')
		$type .= ' ('.strlen($argument).')';

		echo '<strong>Debug #'.(++$i).' '.$of.' '.$total_arguments.'. '.$variable_name.': '.trim($var_names[$i-1]).'  '.$variable_type.': '.$type.'</strong>';

		_d_($argument);
	}

	echo "</pre></fieldset>";
}

?>

Her er et eksempel på brug af dump.php

<?php
session_start();

//	Include the dump.php file
include_once "dump.php";

//	#############	#
function test()
{
	return false;
}

//	--------------	-
function test_null()
{

}

//	#############	#

echo '<!DOCTYPE HTML><html><head><meta http-equiv="content-type" content="text/html;charset=utf-8" /></head><body>';

//	--------------	-
// add a SESSION variable
$_SESSION['my_test'] = "test of dump.php";


echo '<p><fieldset><legend>dump a SESSION variable</legend> <code>dump($_SESSION["my_test");</code></fieldset></p>';
dump($_SESSION["my_test"]);


echo '<p><fieldset><legend>dump all SESSION variable</legend> <code>dump($_SESSION);</code></fieldset></p>';
dump($_SESSION);

//	--------------	-
// 	Test of object
class User
{
	public $first_name;
	public $last_name;

	public function __construct($first, $last)
	{
		$this->first_name = $first;
		$this->last_name = $last;
	}

	public function __toString()
	{
		return "User [first='$this->first_name', last='$this->last_name']";
	}
}

$user_1 = new User('John', 'Doe');
$user_2 = new User('Jane', 'Doe');

//	--------------	-
echo '<p><fieldset><legend>dump object </legend> <code>dump($user_1);</code></fieldset></p>';
dump($user_1);

echo '<p><fieldset><legend>dump object </legend> <code>dump($user_2);</code></fieldset></p>';
dump($user_2);

echo '<p><fieldset><legend>dump 2 variable </legend> <code>dump($user_1, $user_2);</code></fieldset></p>';
dump($user_1, $user_2);

//	--------------	-
echo '<p><fieldset><legend>dump a string (string name is also name of variable)</legend> <code>dump("test");</code></fieldset></p>';
dump("test");

echo '<p><fieldset><legend>dump a float</legend><code>dump($pi);</code></fieldset></p>';
$pi = 3.1415926535897;
dump($pi);

echo '<p><fieldset><legend>dump a integer</legend><code>dump($int_);</code></fieldset></p>';
$int_ = 12345;
dump($int_);

//	--------------	-
echo '<p><fieldset><legend>dump the returned result from a function </legend><code>dump(file("dump.php"));</code></fieldset></p>';
dump(file("dump.php"));

echo '<p><fieldset><legend>dump the returned result from function </legend><code>dump(test());</code></fieldset></p>';
dump(test());
//	--------------	-

echo '<p><fieldset><legend>dump the $_SERVER variable</legend><code>dump($_SERVER);</code></fieldset></p>';
dump($_SERVER);

echo '<p><fieldset><legend>dump a NULL value</legend><code>dump(test_null())</code></fieldset></p>';
dump(test_null());

?>