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Using PEAR::PHP_Debug

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Joined: 16 May 2007
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Location: Italy

PostPosted: Sat May 19, 2007 4:52 pm    Post subject: Using PEAR::PHP_Debug Reply with quote


PHP_Debug is a handy PEAR library for debugging business layer and process flow in PHP. The PEAR::PHP_Debug page can be found at and the external package homepage, complete with examples, is

It comes with a nifty floating div bar - for in page information about what happened during the execution cycle and can give you access to variables, etc and I wanted to include the Smarty vars in the output - rather than use the popup smarty debug console.

To use PHP_Debug in your application:

1) Install the PEAR::PHP_Debug lib with pear install PHP_Debug. It's currently in beta - so you'll need to set your PEAR config to install betas if you haven't already - you can do this with:

pear config-set preferred_state beta

to install PHP_Debug

pear install PHP_Debug

2) Follow the instructions on the PHP_Debug website to copy the templates, scripts and images to the correct place on your site.

3) Add the following code to your extended Smarty class:


   var $_PHPDebugHandler = null;
   function &PHPDebugObj(&$obj=null) {
      if (empty($obj)) {
         return $obj;
      } else {
         // Not empty so set it
         $this->_PHPDebugHandler =& $obj;
   // Assigns the Smarty debug vars (discovered by looking at debug.tpl and then function.assign_debug_info.php)
   // to the PHPDebug object
   // You'll find the information under logs and messages on the PHP_Debug div bar
   function PHPDebugAssignSmartyVars() {
      if (!empty($this->_PHPDebugHandler)) {
         $this->_PHPDebugHandler->dump($this->_tpl_vars,"Smarty Assigned Vars");
         if (@is_array($smarty->_config[0])) {
            $config_vars = $smarty->_config[0];
            $this->_PHPDebugHandler->dump(array_keys($config_vars),"Smarty Config Keys");
            $this->_PHPDebugHandler->dump(array_values($config_vars),"Smarty Config Vals");
         $included_templates = $this->_smarty_debug_info;
         $this->_PHPDebugHandler->dump(array_keys($assigned_vars),"Smarty Debug Keys");
         $this->_PHPDebugHandler->dump(array_values($assigned_vars),"Smarty Debug Vals");         
         $this->_PHPDebugHandler->dump($included_templates,"Smarty Debug Tpls");         
   function display($resource_name, $cache_id = null, $compile_id = null) {

This does the guts of letting PHP_Debug know about the Smarty Debug vars.

4) You'll need to define the config array for PHP_Debug somewhere where you defined your constants or global config info. The config array I use is - but you'll need to change the paths to suit your environment:

$phpDebugOptions =
      'render_type'          => 'HTML',    // Renderer type
      'render_mode'          => 'Div',     // Renderer mode
      'restrict_access'      => false,     // Restrict access of debug
      'allow_url_access'     => true,      // Allow url access
      'url_key'              => 'key',     // Url key
      'url_pass'             => 'nounou',  // Url pass
      'enable_watch'         => true,     // Enable wath of vars
      'replace_errorhandler' => true,      // Replace the php error handler
      'enable_w3c_validator' => false,   // Validate the output
      // Renderer specific
      'HTML_DIV_view_source_script_name' => 'PHP_Debug_ShowSource.php',
      'HTML_DIV_remove_templates_pattern' => false,
      'HTML_DIV_images_path' => 'templates/default/css/images',
      'HTML_DIV_css_path' => 'templates/default/css',
      'HTML_DIV_js_path' => 'javascripts',

5) We're almost done - stick with me! Smile Now we need to include the PHP_Debug library and create an instance of the PHP_Debug class - (my global smarty var is called $thisPage):

$Dbg = new PHP_Debug($phpDebugOptions);

I include the above in my include/common.php.

6) Now you just need to modify your template for the extra bits needed by PHP_Debug. We need an entry in the header template within the <HEAD></HEAD> tags:

      <script type="text/javascript" src="{$phpDebugOptions.HTML_DIV_js_path}/html_div.js"></script>
      <link rel="stylesheet" type="text/css" media="screen" href="{$phpDebugOptions.HTML_DIV_css_path}/html_div.css" />

That's it. If all is well - the next page you load will have the debug panel in the top right of the browser page.

Notice that in stage 5 we assigned the config array to Smarty using $thisPage->assign - this allows smarty to pass the info to PHP_Debug and will ensure your paths are set correctly when the header template is parsed.
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