PHP File Basics

Files in PHP refer to Files and folders (directories)

I. Determining file types

1.filetype ("./aa.txt");//To determine the file type, if the file is returned files, if it is a directory, return dir

2.is_dir ("./test");//Determines whether the given path is not a directory, is the word return true, otherwise false

3.is_file ("./aa.txt");//Determine if the given path is not a file

Two. Get the properties of a file

1.echo date ("Y-m-d h:i:s", Fileatime ("./aa.txt"));//Gets the last access time of the file plus date is the format time

2.echo date ("y-m-d h:i: S", Filectime ("./aa.txt"));//Get File creation time

3.echo date ("Y-m-d h:i:s", Filemtime ("./aa.txt"));//Get File modification time

4.echo filesize ("./aa.txt");//Get the size of the file

5.var _dump (File_exists ("./aa.txt"));//Determine if a file exists, returns True, does not exist return false

Three. File path

1. Current path (directory):./or do not write

2. Parent directory:. /

3. Subordinate Directory: folder name/

4. Root directory:/

root directory/Two layer meaning: if/in PHP Program: Hard disk root directory. If/on the Web page: represents the root directory of the server (we are WWW)

5. Do file upload (avatar, product image), save the path of the data must write absolute path

6. $_server[' Document_toot '; The root directory of the zone server www

Four: Get the path

1. BaseName ("./aa.txt");//Get the file name from the path

2.basename ("./aa.txt", ". txt");//Returns a file name without a suffix

3.dirname ("./test/bb.txt");//Returns the directory in the path

4.pathinfo ("./test/bb.txt");//Return file information (array)

5.realpath ("./test/bb.txt");//convert relative path to absolute path (cannot go from path)

Four. Operation of the Directory

Traverse Directory

Glob ("./ueditor/*");//returns all files under Ueditor (directory)

Glob ("./ueditor/*.js");//Can be filtered by suffix

Get the number of files in a folder

<?PHPEchoShuliang ("./0524");functionShuliang ($filename){    if(Is_dir($filename))    {        $attr=Glob($filename." /*"); $SL= 0; foreach($sttr  as $v)        {            if(Is_dir($v))            {                $SL=$SL+shuliang ($v); }            Else            {                Echo $SL++; }                     }        return $SL; }            Else if(Is_file($filename))                {            return1; }        Else        {            return0; }    }?>

Mode two: Open Directory resources you can look up and you can go down.

//Open Directory Resource$dir=Opendir("./liucheng");//open Folder//readdir ($dir);//Read the file, pointing to the next one at a time. The point represents the current directory, ... Representative Injury and catalogue while($v=Readdir($dir)){    if($v= "."||"..")    {            }    Else    {        Echo $v." <br> "; }}Rewinddir($dir);//Reset A pointer to a directory resourceClosedir($dir);//Close Folder?>

PHP File Basics