PHP Processing of files
PHP in the application of server-side files, the related category is not only the user and the server database between the various connection access operations, but also through the PHP built-in file processing functions, for general file processing operations.
BaseName--Returns the file name portion of the path
Syntax format: $path = "/home/httpd/html/index.php";
$file = basename ($path); $file is set to "index.php"
$file = basename ($path, ". php"); $file is set to "index"
PathInfo (): Parse file current path
Syntax format: $path _parts = PathInfo ("/www/htdocs/index.html");
echo $path _parts["DirName"]. "\ n"; /www/htdocs file path
echo $path _parts["basename"]. "\ n"; index.html file and extension
echo $path _parts["extension"]. "\ n"; HTML file format
File types and related information
FileSize (): Calculate file Size (byte)
Syntax format: $bytes =filesize ("A.txt");
Echo $bytes round ($bytes/1024,2);
Fileatime (): File last access time (timestamp)
Syntax format: echo date ("Y-m-d G:i:sa", fileatime);
Filectime (): File settling time
Syntax format: echo date ("Y-m-d G:i:sa", filectime);
Filemtime (): File Last update time
Syntax format: echo date ("Y-m-d G:i:sa", filemtime);
Fileperms (): File attributes and Permissions 10 binary
Syntax format: Echo substr (Base_convert (Fileperms (a.txt), 10,8), 3);
Fileowner (): Uid of the file owner (useful only under Linux systems)
Syntax format: Echo fileowner ("A.txt");
Operation of the file
The ' R ' read-only mode opens, pointing the file pointer to the file header.
The ' r+ ' read-write mode opens, pointing the file pointer to the file header.
The ' W ' 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.
The ' 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 ' writes open, pointing the file pointer at the end of the file. If the file does not exist, try to create it.
The ' A + ' read-write mode opens, pointing the file pointer at the end of the file. If the file does not exist, try to create it.
' X ' is created and opened 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+ ' is created and opened as 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.
fopen ()--open file or URL
Fclose ()--Close an open file pointer
Fread ()--Read file contents
Fwrite ()--Write file
Syntax format: if (! $f = @fopen ("file03.php", "X")) {//Open a file X method write
Die ("file read failed"); Read failed
}
Fwrite ($f, "kkkkkkkkkk"); Write something to that file.
Echo fread ($f, 10); Read the contents of this file
Fclose ($f); Close Open File
File ()--reads the entire document into an array
Syntax format: $arr =file ("file03.php");
Print_r ($arr); Reading a file returns an array
ReadFile ()-Reads a file and writes to the output buffer.
Syntax format: $str =readfile ("file03.php");
Echo $str; Output
The notation of a file register:
$f =fopen ("file03.php", "R");
$i =fread ($f, 1000);
echo "This is your {$i} second visit";
Fclose ($f);
$f =fopen ("file03.php", "w");
$i + +;
Fwrite ($f, $i);
Fclose ($f);
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File_get_contents () – reads the entire file into a string
Syntax format: file_get_contents (file name or URL)
File_put_contents () – writes a string to a file, and then calls fopen (), fwrite (), and fclose () functions
File_put_contents (file name, write data)
Feof ()--Test whether the file pointer is to the end of the file position
Ftell ()--Returns the position of the file pointer read/write
Syntax format ftell (file pointer)
Flock ()--Light consultation file lock
Syntax format: flock (file pointer, control parameter)
File pointer: is an already open (fopen) file pointer control parameter:
"Lock_sh" means to get a shared lock (read program), (PHP4.0.1 previous version set 1).
"LOCK_EX" means to obtain an exclusive lock (writer), (PHP4.0.1 was set to 2 in previous versions).
"Lock_un" means to release the lock (regardless of share or exclusive), (PHP4.0.1 was set to 3 in previous versions).
"LOCK_NB" means that if you do not want flock () to block when locked, then add this parameter to the control parameter
Fseek ()--Locating in the file pointer
Syntax structure: fseek (file pointer, move character count [, starting position constant])
File pointer: cannot be used to open the returned file pointer in fopen () in the format "http:/" or "ftp://".
Move the number of characters: when positive, move the file pointer forward a specified number: When negative, move the file pointer backward by the specified number:
Starting position constant:
Seek_cur-Sets the position to the current position.
Seek_set-Sets the position equal to the beginning of the file. (default value)
Seek_end-Set the location to the end of the file.
Rewind ()--Rewind the position of the file pointer, that is, move the file pointer to the beginning of the file.
Syntax structure: Rewind (file pointer)
Note: If you open the file in append ("a" or "A +") mode, any data written to the file will always be appended, regardless of the location of the file pointer
CHGRP ()--Change the group to which the file belongs
Syntax structure: chgrp (file name, group name)
Filegroup ()--Group to get files
Syntax structure: Filegroup (file name)
chmod ()--Change file mode
Syntax structure: chmod (file name, privilege constant) 755 666
Chown ()--Change the owner of the file
Syntax structure: chown (file name, user)
Fileowner ()--Get the owner of the file
Syntax structure: Fileowner (file name)
Posix_getpwuid () to resolve it to a user name.
Copy ()--Copy file
Syntax structure: Copy (source file, destination file)
return type: bool, returns TRUE if successful, or FALSE if unsuccessful.
Parameter description: Copies the source file to the destination file.
Unlink ()--delete file
Syntax structure: unlink (target file)
return type: bool, returns TRUE if successful, or FALSE if unsuccessful.
Parameter description: Delete the specified target file
Rename ()--Rename a file or directory
Syntax structure: rename (old file name, new filename)
return type: bool, returns TRUE if successful, or FALSE if unsuccessful.
Parameter description: Attempt to rename the old file name to a new one.
File Property Handling
File_exists ()--check whether a file or directory exists
Syntax structure: file_exists (file name)
return type: bool, returns False if present returns True.
FileSize ()--Get file size
Syntax structure: filesize (file name)
Return type: Returns the number of bytes of file size and returns False if an error occurs.
FileType ()--Get file type
Syntax structure: filetype (file name)
Return type: Returns the file type. The possible values are fifo,char,dir,block,link,file and unknown. Error returns false
Is_dir ()--Determines whether a given file name is a directory
Syntax structure: is_dir (name)
Return type: Returns True if the file name exists and is a directory, otherwise false.
Is_executable ()--determine if the given file name is executable
Syntax structure: is_executable (name)
return type: FALSE If the file exists and the executable returns TRUE.
Is_file ()--determine if the given file name is a normal file
Syntax structure: is_file (name)
Return type: Returns TRUE if the file exists and is a normal file.
Is_link ()--Determines whether a given file name is a symbolic connection
Syntax structure: is_link (name)
Return type: Returns True if the file exists and is a symbolic connection.
Is_readable ()--Determines whether a given file name is readable
Syntax structure: is_readable (file name)
Return type: Returns TRUE if the file exists and is readable.
Is_writable ()--Determines whether a given file name can be written
Syntax structure: is_writable (file name)
Return type: Returns TRUE if the file exists and is writable.
Implementing directory Reads for the iterator interface
Standard method for iterator interfaces
Current (): Returns the value of the element in the list.
Next (): Used to move down one position in a list.
Valid (): Detects if there is still the next element in the current list, and returns True if any, otherwise false.
Rewind (): You can access the list of elements for the specified feature, and the pointer is set at the top when you begin operation iterator.
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