• basename – It returns trailing name component of path
• chgrp – It can be used to change file group
• chmod – It can be used to change file permission
• chown – It can be used to change file ownership
• clearstatcache – It can be used to clears file status cache
• copy – It can be used to copy file
• delete – Check unlink() or unset()
• dirname – It returns parent directory’s path
• disk_free_space – It returns available space on filesystem or disk partition
• disk_total_space – It returns the total size of a filesystem or disk partitio
• diskfreespace – Its an alias of disk_free_space()
• fclose – It closes an open file pointer
• feof – It checks for end-of-file on a file pointer
• fflush – It flushes the output to a file
• fgetc – It returns character from file pointer
• fgetcsv – It returns line from file pointer and parse for CSV fields
• fgets – It returns line from file pointer
• fgetss – It returns line from file pointer and strip HTML tags
• file_exists – It checks whether a file or directory exists
• file_get_contents – It reads entire file
• file_put_contents – It writes a string to a file
• file – It reads entire file into an array
• fileatime – It returns last access time of file
• filectime – It returns inode change time of file
• filegroup – It returns file group
• fileinode – It returns file inode
• filemtime – It returns file modification time
• fileowner – It returns  file owner
• fileperms – It returns  file permissions
• filesize – It returns  file size
• filetype – It returns  file type
• flock – It can be used to lock the file
• fnmatch – Match filename against a pattern
• fopen – It opens file or URL
• fpassthru – It outputs all remaining data on a file pointer
• fputcsv – It format line as CSV and write to file pointer
• fputs – Its an  alias of fwrite() and writes to a file
• fread – It can be used to read the content from a file
• fscanf – It parses input from a file according to a format
• fseek – It seeks on a file pointer
• fstat – It returns information about a file using an open file pointer
• ftell – It returns the current position of the file pointer
• ftruncate – It truncates a file to a given length
• fwrite – It writes the string to a file
• glob – It finds pathnames matching a pattern
• is_dir – It checks whether the filename is a directory
• is_executable – It checks whether the filename is executable
• is_file – It checks whether the filename is a regular file
• is_link – It checks whether the filename is a symbolic link
• is_readable – It checks whether the file exists and is readable
• is_uploaded_file – It checks whether the file was uploaded via HTTP POST
• is_writable – It checks whether  the filename is writable
• is_writeable – Its an Alias of is_writable() and  checks whether  the filename is writable
• lchgrp – It changes group ownership of symlink
• lchown – It changes user ownership of symlink
• link – It creates a hard link
• linkinfo – It returns information about a link
• lstat – It returns information about a file or symbolic link
• mkdir – It can be used to create directory
• move_uploaded_file – It moves an uploaded file to a new location
• parse_ini_file – It parses a configuration file
• parse_ini_string – It parse a configuration string
• pathinfo – It returns information about a file path
• pclose – It closes process file pointer
• popen – It opens process file pointer
• readfile – It outputs a file
• readlink – It returns the target of a symbolic link
• realpath_cache_get – It returns realpath cache entries
• realpath_cache_size – It returns realpath cache size
• realpath – It returns canonicalized absolute pathname
• rename – It renames a file or directory
• rewind – It rewinds the position of a file pointer
• rmdir – It can be used to remove a directory
• set_file_buffer – Its an alias of stream_set_write_buffer()
• stat – It returns information about a file
• symlink – It creates a symbolic link
• tempnam – It create file with unique file name
• tmpfile – It creates a temporary file
• touch – It sets access and modification time of file
• umask – It changes file permissions of file
• unlink – It deletes the file

<?php

$fp = “test.txt”;

$number = count(file($fp));

echo ” $number lines “;

?>

<?php

if(file_exists($filePath))
	echo "Exists"

?>

<?php

chmod("/your_dir/your_file", 0600);
// Read and write for owner, nothing for everybody else

chmod("/your_dir/your_file", 0644);
// Read and write for owner, read for everybody else

chmod("/your_dir/your_file", 0755);
// Everything for owner, read and execute for others

chmod("/your_dir/your_file", 0750);
// Everything for owner, read and execute for owner's group

?>