PHP中include與require有什么區別

發布時間：2021-01-13 15:24:31

來源：億速云

閱讀：81

作者：Leah

PHP中include與require有什么區別？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。

先編輯command.php文件echo?'hello'.PHP_EOL;

然后編輯console.php文件for($i=1;$i<=3;++$i){

require?'command1.php';

}

原本想要包含并執行這個echo，沒想到寫錯了文件名，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includefor($i=1;$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或者include_once，只要包含路徑正確，那么循環只執行一次。

總結：

使用require，如果文件沒有包含成功，就會報出一個fatal error，整個程序就中止了。

使用include，如果文件沒有包含成功，就會報出一個普通的warning，之后的代碼仍會執行。

如果你的Web程序使用了MVC這種對文件包含強依賴的設計方法，請使用require_once。

看完上述內容，你們掌握PHP中include與require有什么區別的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！

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