<?php
/****************************************************
 * php處理異常
 * try中不主動throw，會先出現PHP的系統錯誤
 ****************************************************/
header("content-type:test/html:charset=utf-8");
error_reporting(-1);
try {
    $num1 = 3;
    $num2 = 0;
    if ($num2 == 0) {
        throw new Exception
 
("自定義錯誤");
    } else {
        $res = $num1 / $num2;
    }

} catch (Exception $e) {
    echo $e->getMessage();
    // die(); // 終止異常
}
/******************************************************
 * php+mysql+pdo
 *****************************************************/
try {
    $pdo = new PDO("mysql:host=localhost;dbname=mysql", "root", "");
} 
 
catch (PDOException $e) {
    echo $e->getMessage();
    // die(); // 終止異常
}
/******************************************************
 * php+檔案異常
 *****************************************************/

/**
 * PHP 讀取大檔案 SplFileObject :
 * https://blog.csdn.net/ekliu/article/details/8855907
 */
// SqlFileObject相對於傳統的open($filename, 'r')產生的物件的優點在於不需要開啟檔案控制代碼  不需要關閉控制代碼更加的方便
 

$handle = new SplFileObject("sid_list.txt");
while (!$handle->eof()) {
    $item = $handle->fgets();
}

try {
    $pdo = new SplFileObject("text.txt", "r");
    echo "read File";
} catch (Exception $e) {
    echo $e->getMessage();
    // die(); // 終止異常
}
/******************************************************
 * php異常 巢狀
 *****************************************************/
try {
    throw new Exception("測試異常1");
} catch (Exception $e) {
    echo $e->getMessage();
    // die(); // 終止異常
    try {
        throw new Exception("測試異常2");
    } catch (Exception $e) {
        echo $e->getMessage();
    }
}

/******************************************************
 * php異常 自定義異常封裝
 *****************************************************/
class MyException extends Exception
{
    public function __construct($message = "", $code = 0, $previous = null)
    {
        parent::__construct($message, $code, $previous);
    }

    public function __toString()
    {
        $message = "<h2>出現異常，如下：</h2>";
        $message .= "<p>" . __CLASS__ . "[{$this->code}:{$this->message}]</p>";
        return $message;
    }

    /****************自定義異常方法***************/
    public function test()
    {
        echo "這是自定義錯誤";
    }

    public function stop()
    {
        exit("異常 end...");
    }
}

// 開始呼叫 MyException
try {
    echo "出現異常啦";
    throw new MyException("測試自定義異常", 3);
} catch (MyException $e) {
    echo $e->getMessage();
}

// 巢狀使用 MyException 與 Exception (沒有順序)
try {
    throw new MyException("測試自定義異常");
} catch (Exception $e) {
    echo $e->getMessage();
} catch (MyException $e) {
    echo $e->getMessage();
}

/******************************************************
 * php異常 自定義異常封裝    檔案
 *****************************************************/
class FileException extends Exception
{
    public function getDetails()
    {
        switch ($this->code) {
            case 0:
                return "沒有提供檔案";
                break;
            case 1:
                return "檔案不存在";
                break;
            case 2:
                return "不是一個檔案";
                break;
            case 3:
                return "檔案不可寫";
                break;
            case 4:
                return "非法檔案的操作模式";
                break;
        }
    }
}

class WriteData
{
    private $_message = "";
    private $_fp = null;

    public function __construct($filename = null, $mode = "w")
    {
        $this->_message = "檔案:{$filename} ; 模式:{$mode}";
        if (empty($filename)) throw new FileException($this->_message, 0);
        if (!file_exists($filename)) throw new FileException($this->_message, 1);
        if (!is_file($filename)) throw new FileException($this->_message, 2);
        // is_writable — 判斷給定的檔名是否可寫
        if (!is_writable($filename)) throw new FileException($this->_message, 3);
        if (!in_array($mode, array("w", "w+", "a", "a
        +"))) throw new FileException($this->_message, 4);

        $this->_fp = fopen($filename, $mode);
    }

    public function write($data)
    {
        if (@!fwrite($this->_fp, $data . PHP_EOL)) throw new FileException($this->_message, 5);
    }

    public function close()
    {
        if ($this->_fp) {
            if (!fclose($this->_fp)) throw new FileException($this->_message, 6);
            $this->_fp = null;

        }
    }

    public function __destruct()
    {
        $this->close();
    }
}

　　try{
　　　　echo '捕捉異常';
        } catch (throwable $ex) {
            echo $ex->getMessage(), "<br />\n";
            echo $ex->getFile(), "<br />\n";
            echo $ex->getLine(), "<br />\n";
            echo $ex->getTraceAsString(), "<br />\n";
        }