fread() function in PHP

The fread() function used to reading and writing a file.

r - Open file for reading only the file position indicator is placed at the beginning of the file.

r+ -Open file for reading and writing the file position indicator is placed at the beginning of the file.

w - Open file for writing only. any exiting content will be lost.if the file does not exits,PHP attempts to create it.

w+ - Open file for reading and writing. any exiting content will be lost.if the file does not exits,PHP attempts to create it.

a - Open file for appending only. data is written to the end of an existing file. if the file does not exits ,PHP attempts to create it.

a+ - Open file for reading and appending data is written to the end of an existing file. if the file does not exits ,PHP attempts to create it.