PHP file://

Introduction

In PHP, various URL style protocols can be used in conjunction with file system functions, with the help of corresponding built-in wrappers. Custom wrappers can also be defined using the stream_wrapper_register() function.

The default wrapper in PHP is file://, which represents the local file system. If no other protocol is explicitly used, the PHP parser will treat it as a filesystem wrapper. The file name parameters passed to the file system functions fopen(), file_get_contents(), etc. use the file:// protocol by default.

When a filename does not begin with a forward slash, a backslash, or a drive letter in Windows, its path is considered relative to the current directory. However, in the fopen() and file_get_contents() functions, the file name may be searched in the location specified in the include_path directive.

The file:// wrapper supports simultaneous read and write operations, creating and deleting directories, and renaming files. Additionally, file access is not restricted by the allow_url_fopen directive in the php.ini configuration settings.

Example

The file names represented in different possible ways are as follows:

//Absolute path

$file=fopen("C:/xampp/php/test/test.txt","w");

//Relative path (assuming the current working directory is c:\xampp\php, the file is opened in the tst subdirectory)

$file=fopen("test/test.txt","w");

//Current path. Assuming the file will be opened in the c:\xampp\php\test directory, treat it as the current directory

$file=fopen("test.txt","w");

//Use the file:// protocol to represent absolute paths

$file=fopen("file:///c:/xampp/php/test/test.txt","w");

//Use file:// protocolAccess files in the document root directory

$file=fopen("file://localhost/test/test.txt","w");

The above is the detailed content of PHP file://. For more information, please follow other related articles on the PHP Chinese website!