How to count files in a directory using PHP?

PHP contains many functions like count(), iterator_count(), glob(), openddir(), readdir(), scandir() and FilesystemIterator() to count number of files in a directory.
count() Function: The count() functions is an array function which is used to count all elements in an array or something in an object. This function uses COUNT_RECURSIVE as a mode to recursively count the array that is useful for counting all the elements of a multidimensional array.
Syntax: 

int count( mixed $array_or_countable, int $mode = COUNT_NORMAL )

glob() Function: The glob() function is a Filesystem function that searches all possible pathnames matching pattern according to the rules used by the libc glob() function.
Syntax:  

glob( string $pattern, int $flags = 0 )

Program 1: This program uses glob() and count() function to count all files within the directory.  

<?php

// Set the current working directory
$directory = getcwd()."/";

// Initialize filecount variable
$filecount = 0;

$files2 = glob( $directory ."*" );

if( $files2 ) {
    $filecount = count($files2);
}

echo $filecount . "files ";

?>

Output: 

20 files

openddir() Function: The openddir() function is used to open a directory handle. The path of the directory to be opened is sent as a parameter to the opendir() function and it returns a directory handle resource on success, or FALSE on failure.
Syntax:  

opendir( string $path, resource $context )

readdir() Function: The readdir() function is a directory function which reads the entries from directory handle those are returned in the order in which they are stored by the filesystem.
Syntax:  

readdir( resource $dir_handle )

Program 2: This program uses openddir() and readdir() function to count all files within the directory. 

<?php

// Set the current working directory
$dir = getcwd();

// Initialize the counter variable to 0
$i = 0; 

if( $handle = opendir($dir) ) {
    
    while( ($file = readdir($handle)) !== false ) {
        if( !in_array($file, array('.', '..')) && !is_dir($dir.$file)) 
            $i++;
    }
}

// Display result
echo "$i files";

?>

Output: 

20 files

scandir() Function: The scandir() function is used to return an array of files and directories of the specified directory. The scandir() function lists the files and directories which are present inside a specified path.
Syntax:  

scandir( string $directory, int $sorting_order = SCANDIR_SORT_ASCENDING, resource $context )

Program 3: This program uses scandir() and count() function to count all files within the directory. 

<?php

// Set the current working directory
$directory = getcwd()."/";
 
// Returns array of files
$files1 = scandir($directory);
 
// Count number of files and store them to variable
$num_files = count($files1) - 2;

echo $num_files . " files";

?>

Output: 

20 files

FilesystemIterator() Function: The FilesystemIterator::__construct() function is used to create a new filesystem iterator from the path.
Syntax:  

FilesystemIterator::__construct( string $path, 
      int $flags = FilesystemIterator::KEY_AS_PATHNAME 
      | FilesystemIterator::CURRENT_AS_FILEINFO 
      | FilesystemIterator::SKIP_DOTS )

iterator_count() Function: The iterator_count() function is SPL is used to count the iterator elements.
Syntax:  

int iterator_count( $iterator )

Program 4: This program uses FilesystemIterator() and iterator_count() function to count all files within the directory.

<?php

$fi = new FilesystemIterator(__DIR__, FilesystemIterator::SKIP_DOTS);

printf("%d files", iterator_count($fi));

?>

Output:  

20 files