What are the file manipulation functions in PHP
This article will explain in detail what are the file manipulation functions in PHP. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
File operation function
Opendir (path): open a path resource (read all data inside the path into memory)
Readdir (path resource): reads the name of the file pointed to by the current resource pointer from the folder resource, and the pointer moves down one bit.
Closedir (resources): release the corresponding file resources
Scandir (path): reads all the file names within a path and returns an array. Each element of the array is a file name.
File_exists: determine whether a file exists (in a broad sense: path and file)
Is_dir: determines whether a specified path exists (folder)
Is_file: determines whether a specified path is a file (file)
Mkdir: create a path that will report an error if it exists
Rmdir: removing folder
File_get_contents: reads the data contents from a specified file.
File_put_contents: writes the specified string to the corresponding file
Fopen: open a file resource
Fgetc:c stands for character, reading one character at a time
Fgets:s stands for string, which means that multiple characters can be read, depending on the specified read length or whether a newline is encountered (a maximum of one row of data can be read)
Both functions operate on the current resource pointer, and both move the pointer down after reading
Fread: gets the specified length of data until the end of the file
Fwrite: writes data to the location of the file resource pointer. Writing will not move back what already exists in the current location, but will overwrite it.
Fseek: assign the pointer to the corresponding location
Fclose: use the corresponding file resources
Copy: copyin
Unlink: deleting fil
Rename: renaming fil
Filemtime:m stands for modify, and the last time the file was modified
Filesize: file size (bytes)
Fileperms: file permissions (octal under Linux)
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