网上太多关于PHP中include与require区别。然而事实真的如此吗，今天我们就通过一个具体的实例来简单分析验证下
先编辑command.PHP文件
然后编辑console.PHP文件
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：
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
会报出这样的错误：
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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