Introduction: This article introduces the system functions related to file operations in PHP. These functions are also very important. Below, Tianya still gives detailed examples of the more commonly used ones.
basename — Returns the file name part of the path
dirname — Returns the directory part of the path
string basename ( string $path [, string $suffix ] )
string dirname ( string $path )
Example, the code is as follows:
// PHP Blog http://www.php.cn
$path = "/home/httpd/www.phpcn/index.php";
echo basename($path);
echo basename($path, '. php');
echo basename($path, '.xxx');
echo dirname($path);
?>
//Result:
index.php
index
index. php
/home/httpd/www.phpfensi.com
Note: If the file name ends with the correct suffix, then this part will also be removed.
chgrp — change the group to which the file belongs
chown — change The owner of the file
chmod — change the file mode
bool chmod ( string $filename , int $mode )
Example, the code is as follows: chmod('/home/phpha.txt', 0755);
copy, copy file, the code is as follows:
if(copy('index.php', 'index.php.bak')){
echo 'copy success';
}
index.php survives in the current directory. bak file.
delete — see unlink or unset
unlink — delete the file
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 the directory
disk_total_space — Returns the total disk size of a directory
diskfreespace — Alias for disk_free_space
Code As follows:
//Under Windows:
echo disk_free_space("C:"), '
';
echo disk_total_space("C:");
? >
//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 reaches end of file The location of
fread — read a file (safe for binary files)
fwrite — write a file (safe for binary files)
fclose — close an open file pointer
The code is as follows:
$fp = fopen('hello.txt', 'r'); //Open a file
$n = 1;
while(!feof($fp)){
echo $ n, ' - ', fgets($fp), '
'; //Read a line and output
$n++;
}
fclose($fp); //Close the file
?> Read in a line and parse CSV fields
fgetss — Read a line from the file pointer and filter out HTML tags
fputcsv — Format the line into CSV and write to the file pointer
fputs — Alias for fwrite
The code is as follows:
$fp = fopen('hello.txt', 'r');
while(false !== ($char = fgetc($fp))){
echo $char, '-';
}
? & Gt;
// Output:
W-E-L-C-O-M-E-E-O-M-Y-O-O-G-: -H-T-P-P-B-L-O-O-H-P-H-A-A-. -c-o-m-
file_exists — Check whether the file or directory exists, the code is as follows:
if(file_exists('hello.txt')){
echo 'hello.txt exists';
} Else { c el & gt; // Output: hello.txt exist File_get_Contents — reads the entire file File_put_Contents — Write a string to a file file — Read the entire file into an array The code is as follows: if($content = file_get_contents('hello.txt')){ file_put_contents('hello.txt.bak', $content); } ?> //Equivalent to copying a copy of hello.txt if($content = file( 'hello.txt')){ print_r($content); } ?> //Array form, each line is an array member Array ( [0] => ; Welcome to my blog: [1] => http://www.phpfensi.com ) 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 typecode 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'); ?> //Output: 1353329003 1353329003 0 1353330002 0
file
fscanf — Format input from a file fseek — Locate the file pointer fstat — Get file information through the open file pointer ftell — Return the read/write position of the file pointer ftruncate — Truncate the file to The given length glob — Finds the file path matching the 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 For a normal file is_link — Determine whether the given 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 through HTTP POST is_writable — Determine whether Whether the specified file name is writableis_writeable — Alias of is_writableExplanation: 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 — Establish a hard link linkinfo — Get information about a connection lstat — Give information about a file or symbolic link mkdir — Create a new directory move_uploaded_file — Move the uploaded Move the 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 the process file pointer readfile — Output a file readlink — Return The target of the symbolic link realpath — Returns the normalized absolute path name rename — Renames a file or directory rewind — Rewinds the position of the file pointer rmdir — Delete a directoryset_file_buffer — alias for stream_set_write_buffer
stat — gives information about a file
symlink — creates a symbolic link
tempnam — creates a file with a unique file name
tmpfile — creates a temporary file
touch — sets the file’s Access and modification time
umask — change the current umask
clearstatcache — clear the file status cache
Summary: In fact, there are so many file operation functions, most of which are not used. At the same time, you can see that these functions are similar to linux commands. How big.
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