linux环境上，php文件被同一个文件替换以后不能执行
linux环境下，php文件被同一个文件替换以后不能执行
个人搭载的LAMP环境，一切php运行正常。
最近再做一个php项目，单位电脑上有一个php文件，假设为1.php，回家写了一晚上1.php，第二天来到公司的时候把单位的这个1.php覆盖掉了。。。结果发现1.php执行的时候是浏览器显示空白页面，我以为是代码出问题了，就把覆盖前的这个1.php文件从优盘里面考出来，又进行了一次覆盖，结果还是空白页面。。。
代码之前还能运行的，没有问题，这样换两次之后连以前能运行的文件也不能运行了，请大家帮忙看看是啥原因
------解决方案--------------------
ls -al
root文件权限问题.修改文件的权限 777
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