PHP中的異常處理是什麼？

異常是程式執行過程中出現的問題。在程式執行過程中，發生異常時，該語句後面的程式碼將不會被執行，PHP 將嘗試尋找第一個符合的 catch 區塊。如果未捕獲異常，則會發出 PHP 致命錯誤，並顯示「未捕獲異常」。

語法

   try {
      print "this is our try block";
      throw new Exception();
      }catch (Exception $e) {
         print "something went wrong, caught yah! n";
      }finally {
         print "this part is always executed";
      }

Example

的中文翻譯為：

範例

<?php
   function printdata($data) {
      try {
         //If var is six then only if will be executed
         if($data == 6) {
         // If var is zero then only exception is thrown
         throw new Exception(&#39;Number is six.&#39;);
            echo "</p><p> After throw (It will never be executed)";
         }
      }
      // When Exception has been thrown by try block
         catch(Exception $e){
            echo "</p><p> Exception Caught", $e->getMessage();
         }
      //this block code will always executed.
         finally{
            echo "</p><p> Final block will be always executed";
         }
   }
   // Exception will not be rised here
      printdata(0);
      // Exception will be rised
      printdata(6);

?>

輸出

Final block will be always executed
Exception CaughtNumber is six.
Final block will be always executed

注意

##要處理異常，程式碼必須位於try 區塊內。每次嘗試必須至少有一個相應的 catch 區塊。多個catch區塊可用於擷取不同類別的異常。

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