Introduction and usage examples of filesystem file system functions in php_PHP tutorial

basename — Returns the filename part of the path
dirname — Returns the directory part of the path

Copy code The code is as follows:

string basename ( string $path [, string $suffix ] )
string dirname ( string $path )

Example:

Copy code The code is as follows:

$path = "/home /httpd/phpha.com/index.php";
echo basename($path);
echo basename($path, '.php');
echo basename($path, '.xxx' );
echo dirname($path);
?>

Copy code The code is as follows:

//Result:
index.php
index
index .php
/home/httpd/phpha.com

Note: If the file name ends with the correct suffix, this part will also be removed.

chgrp — Change the group the file belongs to
chown — Change the owner of the file
chmod — Change the file mode

Copy code The code is as follows:

bool chmod ( string $filename , int $mode )

Example:

Copy code The code is as follows:

chmod('/home/phpha.txt', 0755);
?>
copy — copy file

if(copy('index.php', 'index.php.bak')){
echo 'copy success';
}
?>
//In the current directory The index.php.bak file is saved under

delete — see unlink or unset
unlink — delete file

Copy code The code is as follows:

if(unlink('index.php.bak' )){
echo 'unlink success';
}
?>
//Deleted index.php.bak

disk_free_space — Returns the free space in a directory
disk_total_space — Returns the total disk size of a directory
diskfreespace — Alias ​​for disk_free_space

Copy the code The code is as follows:

//Under Windows:
echo disk_free_space ("C:"), '
';
echo disk_total_space("C:");
?>

Copy code The code is as follows:

//Result: The number of bytes returned
17433419776
32218386432

fopen — Open a file or URL
fgets — Read a line from the file pointer
feof — Test whether the file pointer has reached the end of the file
fread — Read a file (safe for binary files )
fwrite — write to a file (safe for binary files)
fclose — close an open file pointer

Copy code The code is as follows:

$fp = fopen('hello.txt', 'r'); //Open a file
$n = 1;
while(!feof($fp)){
echo $n, ' - ', fgets($fp), '< ;br />'; //Read a line and output
$n++;
}
fclose($fp); //Close the file
?>

Copy code The code is as follows:

//Output:
1 - Welcome to my blog:
2 - http://www.jb51.net

fgetc — Read characters from a file pointer
fgetcsv — Read a line from a file pointer and parse CSV fields
fgetss — Read a line from a file pointer and filter out HTML tags
fputcsv — Format rows to CSV and write to file pointer
fputs — alias for fwrite

Copy code The code is as follows:

$fp = fopen('hello.txt', 'r');
while(false !== ($char = fgetc($fp))){
echo $char, '-';
}
?>

Copy code The code is as follows:

//Output:
W-e-l-c-o-m-e- -t-o- -m-y- -b-l-o-g- :- - -h-t-t-p-:-/-/-b-l-o-g-.-p-h-p-h-a-.-c-o-m-

file_exists — Check if a file or directory exists

Copy code The code is as follows:

if(file_exists('hello.txt')) {
echo 'hello.txt exists';
}else{
echo 'hello.txt not exists';
}
?>

[ /code]
//Output:
hello.txt exists
[/code]

file_get_contents — Read the entire file into a string
file_put_contents — Write a string into the file
file — Read the entire file into an array

Copy code The code is as follows:

if($content = file_get_contents('hello.txt ')){
file_put_contents('hello.txt.bak', $content);
}
?>
//Equivalent to copying a copy of hello.txt
< ?php
if($content = file('hello.txt')){
print_r($content);
}
?>
//Array form, each line is An array member
Array
(
[0] => Welcome to my blog:
[1] => http://www.jb51.net
)

fileatime — Get the last access time of the file
filectime — Get the inode modification time of the file
filegroup — Get the group of the file
fileinode — Get the inode of the file
filemtime — Get the file modification time
fileowner — Get the owner of the file
fileperms — Get the permissions of the file
filesize — Get the file size
filetype — Get the file type

Copy code The code is as follows:

echo fileatime('hello.txt');
echo filectime('hello.txt');
echo filegroup('hello.txt');
echo filemtime('hello.txt');
echo fileowner('hello.txt') ;
echo substr(sprintf('%o', fileperms('hello.txt')), -4);
echo filesize('hello.txt');
echo filetype('hello. txt');
?>

Copy code The code is as follows:

//Output:
1353329003
1353329003
0
1353330002
0
0666
42
file

flock — Lightweight advisory file locking
fnmatch — Match filenames with patterns
fflush — Output buffer contents to a file
fpassthru — Output all remaining data at the file pointer
fscanf — From Format input in the file
fseek — locate the file pointer
fstat — obtain file information through the opened file pointer
ftell — return the read/write position of the file pointer
ftruncate — truncate the file to given length
glob — Find file paths matching pattern

is_dir — Determines whether the given file name is a directory
is_executable — Determines whether the given file name is executable
is_file — Determines whether the given file name is a normal file
is_link — Determines whether the given file name is executable Determine whether the file name is a symbolic link
is_readable — Determine whether the given file name is readable
is_uploaded_file — Determine whether the file was uploaded via HTTP POST
is_writable — Determine whether the given file name is writable
is_writeable — Alias ​​of is_writable
Description: The above functions are used to determine whether the file or directory meets the corresponding conditions and return TRUE or FALSE.

lchgrp — Changes group ownership of symlink
lchown — Changes user ownership of symlink
link — Create a hard link
linkinfo — Get information about a connection
lstat — Give a file or symbol Connection information
mkdir — Create a new directory
move_uploaded_file — Move the uploaded file to a new location
parse_ini_file — Parse a configuration file
pathinfo — Return file path information
pclose — Close the process file pointer
popen — Open process file pointer
readfile — Output a file
readlink — Return the target pointed to by the symbolic link
realpath — Return the canonical absolute path name
rename — Rename a file or Directory
rewind — Rewind the position of the file pointer
rmdir — Delete the directory
set_file_buffer — Alias ​​of stream_set_write_buffer
stat — Give information about the file
symlink — Create a symbolic link
tempnam — Create a file with a unique file name
tmpfile — Create a temporary file
touch — Set the access and modification time of the file
umask — Change the current umask
clearstatcache — Clear the file status cache

http://www.bkjia.com/PHPjc/735242.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/735242.htmlTechArticlebasename — Returns the file name part of the path dirname — Returns the directory part of the path Copy the code The code is as follows: string basename ( string $path [, string $suffix ] ) string dir...