Sixth chapter PHP directory and file Operation _php Tutorial

A Directory Operations
BaseName--Returns the file name portion of the path
DirName--Returns the directory portion of the path
PathInfo--Returns information about the file path
Realpath--Returns the normalized absolute path name
Copy CodeThe code is as follows:
$path = ' demo1.php ';
$path = Realpath ($path);
Echo basename ($path);
Echo '
';
echo dirname ($path);
Echo '
';
$array _path = PathInfo ($path);
Echo ' basename: '. $array _path[' basename ']. '
';
Echo ' dirname: '. $array _path[' dirname ']. '
';
echo ' extension: '. $array _path[' extension ']. '
';
echo ' filename: '. $array _path[' filename '. '
';
?>

Output:
demo1.php
D:\AppServ\www\Basic6
basename:demo1.php
Dirname:d:\appserv\www\basic6
extension:php
Filename:demo1

Two Disk, directory, and file count
1. View file size and disk space
FileSize--Get file size
Disk_free_space--Returns the free space in the directory
Disk_total_space--Returns the total disk size of a directory
Copy CodeThe code is as follows:
$path = ' demo2.php ';
$path = Realpath ($path);
$drive = ' C: ';
Echo Round (FileSize ($path)/1024,2). ' KB '. '
';
Echo Round (Disk_free_space ($drive)/1024/1024/1024,2). ' GB '. '
';
Echo Round (Disk_total_space ($drive)/1024/1024/1024,2). ' GB '. '
';
?>

Output
0.26kb
10.61GB
30.01GB

2. Various time to obtain documents
Fileatime--Get the last access time of the file
Filectime--Get the Inode modification time of the file
Filemtime--Get File modification time
Copy CodeThe code is as follows:
$file = Realpath ('.. /basic5/demo3.php ');
$date _format = ' y-m-d h:i:s ';
Echo ' Lastest accessing time: '. Date ($date _format, Fileatime ($file)). '
';
Echo ' Lastest change time: '. Date ($date _format, Filectime ($file)). '
';
Echo ' Lastest Modify time: '. Date ($date _format, Filemtime ($file)). '
';
?>

Output
Lastest accessing time:2011-12-18 04:26:49
Lastest Change time:2011-12-18 04:26:49
Lastest Modify time:2011-12-18 04:29:15

Three File processing
Two ways to read and write files:
1.php all versions are supported by the method:
fopen--Open file or URL
Fclose--Close an open file pointer
Fwrite-Write file (can be used safely for binary files)
Table 1. List of possible values for mode in fopen ()

Mode	Description
' R '	Read-only opens, pointing the file pointer to the file header.
' R+ '	Read-write mode opens, pointing the file pointer to the file header.
' W '	The Write method opens, pointing the file pointer to the file header and truncating the file size to zero. If the file does not exist, try to create it.
' w+ '	Read-write mode opens, pointing the file pointer to the file header and truncating the file size to zero. If the file does not exist, try to create it.
A	Write to open, pointing the file pointer to the end of the file. If the file does not exist, try to create it.
' A + '	Read-write mode opens, pointing the file pointer to the end of the file. If the file does not exist, try to create it.
' X '	Creates and opens in writing, pointing the file pointer to the file header. If the file already exists, the fopen () call fails and returns false, and generates an e_warning level error message. If the file does not exist, try to create it. This specifies o_excl| for the underlying open (2) system call The o_creat tag is equivalent. This option is supported by PHP 4.3.2 and later versions and can only be used on local files.
' x+ '	Creates and opens read-write, pointing the file pointer to the file header. If the file already exists, the fopen () call fails and returns false, and generates an e_warning level error message. If the file does not exist, try to create it. This specifies o_excl| for the underlying open (2) system call The o_creat tag is equivalent. This option is supported by PHP 4.3.2 and later versions and can only be used on local files.

Copy CodeThe code is as follows:
$fp = fopen (' file1.txt ', ' W ');
$OUTSTR = "My name is Anllin,\r\nmy 29.";
Fwrite ($fp, $outStr, strlen ($OUTSTR));
Fclose ($FP);
?>

Output
My name is Anllin,
My age is 29.
2.PHP5 new ways to join
File_put_contents--Writes a string to the file
Copy CodeThe code is as follows:
File_put_contents (' File2.txt ', "My name is Anllin,\r\nmy age is 29.");
?>

Output
My name is Anllin,
My age is 29.
How to read the contents of a file:

Function	Function
FGETC ()	Reads a character and moves the pointer to the next character
Fgets ()	Reads a line of characters, and you can specify the length of a line display.
FGETSS ()	Reads a row from the file pointer and filters out HTML tags
Fread ()	Read the quantitative characters
Fpassthru ()	Output file to all remaining data at the specified point
File ()	Reads the entire file into an array, grouped by rows
Readfile ()	Read in a file and write to the output buffer
File_get_contents ()	Reads the entire file into a string
Feof ()	Judging the function of reading the file
File_exists ()	To see if a file exists

The contents of the sample file File1.txt are as follows:
My name is Anllin,
My age is 29.
FGETC--reading characters from the file pointer
demo.php
Copy CodeThe code is as follows:
$fp = fopen (' file1.txt ', ' R ');
echo fgetc ($FP);
echo fgetc ($FP);
Fclose ($FP);
?>

Output:
My
Fgets--Reads a line from the file pointer
Copy CodeThe code is as follows:
$fp = fopen (' file1.txt ', ' R ');
Echo fgets ($FP);
Echo fgets ($FP);
Fclose ($FP);
?>

Output
My name is Anllin, my 29.
FGETSS--Reads a line from the file pointer and filters out HTML tags
Copy CodeThe code is as follows:
$fp = fopen (' File3.txt ', ' W ');
$OUTSTR = "My name is Anllin";
Fwrite ($fp, $outStr, strlen ($OUTSTR));
Fclose ($FP);
$ftp = fopen (' file3.txt ', ' R ');
echo Fgetss ($FTP);
Fclose ($FTP);
?>

Output
My name is Anllin
Fread--read files (can be used safely in binary files)
Copy CodeThe code is as follows:
$filename = ' file1.txt ';
$fp = fopen ($filename, ' R ');
$contents = Fread ($fp, FileSize ($filename));
Echo $contents;
Fclose ($FP);
?>

Output
My name is Anllin, my 29.
Fpassthru--All remaining data at the output file pointer
Copy CodeThe code is as follows:
$filename = ' file1.txt ';
$fp = fopen ($filename, ' RB ');
$leftSize = Fpassthru ($FP);
Echo $leftSize;
Fclose ($FP);
?>

Output
My name is Anllin, my 29. 33
FILE--Reads the entire document into an array
Copy CodeThe code is as follows:
$lines = File (' file1.txt ');
foreach ($lines as $line _num = $line)
{
echo $line _num. ': ' $line. '
';
}
?>

Output
0:my name is Anllin,
1:my is 29.
ReadFile--Output a file
Copy CodeThe code is as follows:
$size = ReadFile (' file1.txt ');
Echo $size;
?>

Output
My name is Anllin, my 29.33
File_get_contents--Reads the entire file into a string (php5.0 new)
Copy CodeThe code is as follows:
$contents = file_get_contents (' file1.txt ');
Echo $contents;
?>

Output
My name is Anllin, my 29.
Feof--Test whether the file pointer is to the end of the file location
Copy CodeThe code is as follows:
$fp = fopen (' file1.txt ', ' R ');
while (!feof ($FP))
{
echo fgetc ($FP);
}
Fclose ($FP);
?>

Output
My name is Anllin, my 29.
File_exists--Check whether a file or directory exists
Copy CodeThe code is as follows:

$filename = ' file1.txt ';
if (file_exists ($filename))
{
Echo ' perform file read and write operations ';
}
Else
{
Echo ' The file you are looking for does not exist ';
}
?>

Output
Perform file read and write operations
FileSize--Get file size
Copy CodeThe code is as follows:
$file _size = filesize (' file1.txt ');
echo $file _size;
?>

Output
33
Unlink--Deleting files
Copy CodeThe code is as follows:
$isDeleted = unlink (' File3.txt ');
Echo $isDeleted;
?>

Output
1
Rewind--Rewind the position of the file pointer
Ftell--Returns the position of the file pointer read/write
Fseek--Locating in the file pointer
Copy CodeThe code is as follows:
$fp = fopen (' file1.txt ', ' R ');
Fgetc ($FP);
Fgetc ($FP);
Echo Ftell ($FP). '
';
Rewind ($FP);
Echo Ftell ($FP). '
';
Fgetc ($FP);
Fgetc ($FP);
Echo Ftell ($FP). '
';
Fseek ($fp, 0);//same as Rewind ($FP)
Echo Ftell ($FP). '
';
?>

Output
2
0
2
0
Flock Value of the operation

Action Value	Significance
Lock_sh (formerly 1)	Read/write lock. This means that files can be shared and other people can read the file
LOCK_EX (formerly 2)	Write Operation Lock. This is mutually exclusive and the file cannot be shared
Lock_un (formerly 3)	Release existing Locks
LOCK_NB (formerly 4)	Prevent blocking when requesting locking

Flock--Light consultation document lock
Copy CodeThe code is as follows:
$filename = ' file1.txt ';
$fp = fopen ($filename, ' RB ');
Flock ($FP, lock_ex);//locked
$contents = Fread ($fp, FileSize ($filename));
Flock ($FP, lock_un);//unlocked
Echo $contents;
Fclose ($FP);
?>

Output
My name is Anllin, my 29.
Directory handle operation
Opendir--Open the directory handle
Readdir--Reading entries from the directory handle
Closedir--Close the directory handle
Copy CodeThe code is as follows:
$dir = Opendir ('.. /basic6 ');
while (!! $file = Readdir ($dir))
{
echo $file. '
';
}
Closedir ($dir);
?>

Output
.
..
. BuildPath
. Project
. settings
demo1.php
demo10.php
demo11.php
demo12.php
demo13.php
demo14.php
demo15.php
demo16.php
demo17.php
demo18.php
demo19.php
demo2.php
demo20.php
demo3.php
demo4.php
demo5.php
demo6.php
demo7.php
demo8.php
demo9.php
File1.txt
File2.txt
Scandir--Lists files and directories in the specified path
Copy CodeThe code is as follows:
$files = Scandir ('.. /basic6 ');
foreach ($files as $file)
{
echo $file. '
';
}
?>

Output
.
..
. BuildPath
. Project
. settings
demo1.php
demo10.php
demo11.php
demo12.php
demo13.php
demo14.php
demo15.php
demo16.php
demo17.php
demo18.php
demo19.php
demo2.php
demo20.php
demo21.php
demo3.php
demo4.php
demo5.php
demo6.php
demo7.php
demo8.php
demo9.php
File1.txt
File2.txt
Rename--Rename a file or directory
Copy CodeThe code is as follows:
Rename (' demo1.php ', ' demo01.php ');
if (file_exists (' demo01.php '))
{
echo ' File rename success ';
}
Else
{
echo ' file rename fail ';
}
?>

Output
File Rename Success
RmDir--Delete directory
Copy CodeThe code is as follows:
RmDir (' 123 ');
if (file_exists (' 123 '))
{
Echo ' delete file fail ';
}
{
Echo ' Delete file Success ';
}
?>

Output
Delete file success

http://www.bkjia.com/PHPjc/324803.html www.bkjia.com true http://www.bkjia.com/PHPjc/324803.html techarticle A. Directory Operation BaseName--Returns the filename part of the path dirname--Returns the directory part of the path PathInfo--Returns the file path information Realpath--Returns the normalized absolute ...

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