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HomeBackend DevelopmentPHP TutorialPHP文件处理操作文件

除了可以对文件内容进行读写,对文件本身同样也可以进行操作,如复制文件、重新命名、查看修改日期等。PHP内置了大量的文件操作函数,常用的文件函数如下表:

函数原型

函数说明

举例

bool copy(string path1,string path2)

将文件从path1复制到path2。如果成功则返回true,失败返回false。

copy('tm.txt','../tm.txt')

bool rename(string filename1,string filename2)

把name1重新命名为name2

rename('1.txt','test.txt')

bool unlink(string filename)

删除文件,成功返回true,失败返回false。

unlink('tm.txt')

int fileatime(string filename)

返回文件最后一次被访问的时间,以Linux时间戳的方式返回

fileatime('test.txt')

int filemtime(string filename)

返回文件最后一次被修改的时间,以Linux时间戳的方式返回

date("Y-m-d H:i:s",filemtime("test.txt"))

int filesize(string filename)

取得文件filename的大小

(bytes)

filesize('1.txt')

array pathinfo(string name[,int options])

返回一个数组,包含文件的name的路径信息。有dirname,basename和extension。可通过option设置要返回的信息,有PATHINFO_DIRNAME、PATHINFO_BASENAME和PATHINFO_EXTENSION。默认为返回全部

$arr=pathinfo('/tm/s1/16/4/9/1.txt');

foreach($arr as $method=>$value){

   echo $method.":".$value."
";

}

string realpath(string filename)

返回文件filename的绝对路径,如D:\wampserver\www\test\test.txt

realpath(test.txt)

array stat(string filename)

返回一个数组,包括文件的相关信息,如上面提到的文件大小、最后修改时间等。

$arr=stat('test.txt');

foreach($arr as $method=>$value){

      echo $method.":".$value."
";

}

 

说明:

在读写文件时,除了file()、readfile()等少数几个函数外,其他操作必须要先使用fopen()函数打开文件,最后用fclose()函数关闭文件,而文件的信息函数(filesize(),filemtime()等)则都不需要打开文件,只要文件存在即可。

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