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HomeBackend DevelopmentPHP Tutorial一句代码不太明白

echo "
 文件上次修改时间".date("Y-m-d H:i:s)",$file_info['mtime']);

echo "
 文件上次修改时间"这一段看的懂 
后面加 .date("Y-m-d H:i:s)",连接 为什么要加这俩双引号,而且后面引号 为什么放在括号外面。 就这不明白


回复讨论(解决方案)

写错了吧,
echo "
 文件上次修改时间".date("Y-m-d H:i:s",$file_info['mtime']);

date("Y-m-d H:i:s",$file_info['mtime']);
date("Y-m-d H:i:s)",$file_info['mtime']);

多了一个括号而已,运行下就明白了。

写错了,那个括号不应该有。

写错了,那个括号不应该有。

写错了,那个括号不应该有。

你的代码:.date("Y-m-d H:i:s )",$file_info['mtime']);
换成:.date("Y-m-d H:i:s",$file_info['mtime']);

你觉得不理解的地方,是最不该不理解的地方
到那里字符串还没有结束,你就不能断章取义

字符串中可以保存任何内容,当然也包括 date 的格式串

你把 date("Y-m-d H:i:s",$file_info['mtime'])当成字符串
PHP用点  ( . )  拼接字符串的

echo "
 文件上次修改时间"   .   date("Y-m-d H:i:s",$file_info['mtime'])  ;

由一位粗心者,引发的讨论

谢谢大家  刚开始学 有很多基础不明白 结贴啦

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