《PHP實例:PHP中include和require的區別實例分析》要點:
本文介紹了PHP實例:PHP中include和require的區別實例分析,希望對您有用。如果有疑問,可以聯系我們。
先編輯command.php文件PHP教程
echo 'hello'.PHP_EOL;
然后編輯console.php文件PHP教程
for($i=1;$i<=3;++$i){ require 'command1.php'; }
原本想要包含并執行這個echo,沒想到寫錯了文件名,如果是require,會報出這樣的錯誤:PHP教程
Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4 Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4 PHP Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4 PHP Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4
如果把require改為includePHP教程
for($i=1;$i<=3;++$i){ include 'command1.php'; }
會報出這樣的錯誤:PHP教程
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.PHP教程
總結:PHP教程
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.PHP教程
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.PHP教程
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.PHP教程
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