<?php
/* ▼▼  ErrorHandler  ▼▼ */
class ErrorHandler {
  var $list = array();
  
  function ErrorHandler($name = '') {
    static $err_stock = array();
    
    $this->name = $name;
    $this->list =& $err_stock;
    $this->pos = count($this->list);
    
    if(version_compare(phpversion(), '5.0.0', '>=')) {
      set_error_handler(array(&$this, 'set'), E_ALL);
    } else {
      set_error_handler(array(&$this, 'set'));
    }
    echo "▼ $this->name エラーハンドラをセットしました\n";
    register_shutdown_function(array(&$this, 'destroy'));
  }
  
  function set($errno, $errstr, $errfile, $errline) {
    for($i = 0; $i < ($this->pos + 1); $i++) {
      $this->list[$i][] = "[$errno] $errstr $errfile $errline";
    }
  }
  
  function get() {
    $message = '';
    while(count($this->list[$this->pos])) {
      $message .= $this->name . array_pop($this->list[$this->pos]) . "\n";
    }
    return $message;
  }
  
  function isError() {
    return !empty($this->list[$this->pos]);
  }
  
  function reset() {
    restore_error_handler();
    unset($this->list[$this->pos]);
    echo "▲ $this->name エラーハンドラを破棄しました\n";
  }
  
  function destroy() {
    unset($this->list);
    restore_error_handler();
  }
}

/* ▼▼  Mail  ▼▼ */

class Helper_Mail {
  function sendOrder() {
    $objMail = new Send_Mail_Ex;
    
    $objErr = new ErrorHandler('['.get_class($this).']');  // ▼▼ set_error_handler    ▼▼
      $objMail->sendMail();
    if($objErr->isError()) {
      echo "エラー処理\n";
    }
    $objErr->reset();                                      // ▲▲ restre_error_handler ▲▲
  }
}

class Send_Mail_Ex extends Send_Mail{
  function Send_Mail_Ex() {
    parent::Send_Mail();
  }
}

class Send_Mail {
  function Send_Mail() {
    $buf = 1 / 0; // error
  }
  
  function sendMail() {
    trigger_error('Send_Mail の sendMail() でエラー'); // error
  }
}

/* ▼▼  LC_Page_hoge  ▼▼ */

trigger_error('set_error_handlerする前にtrigger_error');

echo "<pre>";

$obj = new ErrorHandler('[LC_Page_hoge1]');  // ▼▼ set_error_handler    ▼▼
  trigger_error('LC_Page_hoge の process() でエラー'); // error
  $c = new Helper_Mail;
  $c->sendOrder();
echo $obj->get();
$obj->reset();                               // ▲▲ restre_error_handler ▲▲

$obj = new ErrorHandler('[LC_Page_hoge2]');  // ▼▼ set_error_handler    ▼▼
  $objMail = new Send_Mail_Ex(); // error
echo $obj->get();
$obj->reset();                               // ▲▲ restre_error_handler ▲▲

echo "</pre>";

?>