先编辑command.php文件
echo 'hello'.php_eol;
然后编辑console.php文件
for($i=1;$i<=3;++$i){
require 'command1.php';
}
原本想要包含并执行这个echo，没想到写错了文件名，如果是require，会报出这样的错误：
warning: require(command1.php): failed to open stream: no such file or directory in console.php on line 4
fatal error: require(): failed opening required 'command1.php' (include_path='.') in console.php on line 4
php warning: require(command1.php): failed to open stream: no such file or directory in console.php on line 4
php fatal error: require(): failed opening required 'command1.php' (include_path='.') in console.php on line 4
如果把require改为include
for($i=1;$i<=3;++$i){
include 'command1.php';
}
会报出这样的错误：
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，只要包含路径正确，那么循环只执行一次。
总结：
使用require，如果文件没有包含成功，就会报出一个fatal error，整个程序就中止了。
使用include，如果文件没有包含成功，就会报出一个普通的warning，之后的代码仍会执行。
如果你的web程序使用了mvc这种对文件包含强依赖的设计方法，请使用require_once。
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