Copy png files from the directory recursively to the destination directory

copy-png-files.php

<?php
/** Copy PNG files from the Source Directory( and its child directories) to destination as specified
 *
 * I use it to move all the png files from the extracted subtle patterns directories to another directory
 *
 * @param string $path the directory which contains our subdirectories
 * @param string $destination_dir the absolute path to directory where files will be moved
 */
function copy_png_files( $path, $destination_dir ) {

	if ( ! is_readable( $path )  ) {
		return ;
	}

	echo "\r\n Copying..." . $path;

	if ( is_file( $path )   ) {

		//copy it to the root only if png
		if ( strpos( $path, '.png' ) !== false ) {

			$new_file = $destination_dir . DIRECTORY_SEPARATOR . basename( $path );

			//do not override
			if ( ! file_exists( $new_file ) ) {
				copy( $path, $new_file );
			}
		}

		return ;
	}

	//if we are here, It is a directory

	$files = scandir( $path );

	foreach ( $files as $file ) {

		if ( $file == '.' || $file == '..' ) {
			continue;
		}

		copy_png_files( $path . DIRECTORY_SEPARATOR . $file, $destination_dir );
	}
}

//Example
//copy_png_files( '/home/sbrajesh/Desktop/color-scheme/patterns', '/home/sbrajesh/Desktop/patterns' );

/**
 * Run as
 * php copy-png-files.php
 * from the command line
 */