The PHP fclose() function closes an open file pointer that was opened by fopen() or fsockopen().

The PHP feof() function checks if the “end-of-file” (EOF) has been reached for an open file.

The PHP fflush() function writes all buffered output to an open file.

The PHP fgetc() function returns a single character from an open file.

The PHP fgetcsv() function parses a line from an open file, checking for CSV fields.

The PHP fgets() function returns a line from an open file.

The PHP file() reads a file into an array which contains a line from the file, with the newline character still attached.

The PHP file_exists() function checks whether a file or directory exists.

The PHP file_get_contents() reads a file into a string.

The PHP file_put_contents() writes data to a file.

The PHP fileatime() function returns the last access time of the specified file.

The PHP filectime() function returns the last time a file was changed (regular changes or changes to permissions, owner, group or other metadata).

The PHP filegroup() function returns the group ID of a file.

The PHP fileinode() function returns the inode of the specified file.

The PHP filemtime() function returns the last time the file content was modified.

The PHP fileowner() function returns the user ID (owner) of the specified file.

The PHP fileperms() function returns the permissions for a file.

The PHP filesize() function returns the size of a file.