網路上太多關於PHP中include與require區別。然而事實真的如此嗎，今天我們就透過一個具體的實例來簡單分析驗證下
先編輯command.php檔案
echo 'hello'.PHP_EOL;
然後編輯console.php檔案
for($i=1;$i<=3;++$i){
require 'command1.php';
}原本想要包含並執行這個echo，沒想到寫錯了檔名，如果是require，會報出這樣的錯誤：
Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4 Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4 PHP Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4 PHP Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4
如果把require改為include
for($i=1;$i<=3;++$i){
include 'command1.php';
}會報出這樣的錯誤：
Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4
如果使用require_once或include_once，只要包含路徑正確，那麼循環#只執行一次。
總結：
使用require，如果檔案沒有包含成功，就會報出一個fatal error，整個程式就中止了。
使用include，如果檔案沒有包含成功，就會報出一個普通的warning，之後的程式碼仍會執行。
如果你的網路程式使用了MVC這種對檔案包含強依賴的設計方法，請使用require_once。
以上是使用include和require的區別實例分析的詳細內容。更多資訊請關注PHP中文網其他相關文章！
