Code snippet to get all attached media in WordPress and store the file paths into a text file.

wp-get-all-attachment-media-paths.php

// Put this script along with wp-load.php only

$curr_dir = getcwd();
include_once( $curr_dir . '/wp-load.php' );

if( defined( 'ABSPATH' ) ){

	remove_all_filters( 'wp_get_attachment_url' );
	remove_all_filters( 'get_attached_file' );

	$args = array(
		'post_type' => 'attachment',
		'posts_per_page' => -1,
		'post_status' => 'any',
	);

	$posts_query = new WP_Query( $args );
	$posts = $posts_query->posts;

	$file_paths = array();
	$file_ids = array();

	foreach( $posts as $post ){
		$attached_file = get_attached_file( $post->ID );
		$file_paths[] = $attached_file;

		$meta_data = wp_get_attachment_metadata( $post->ID );
		$file_name = basename( $attached_file );
		$mime_type = $post->post_mime_type;
		$mime = explode( '/', $mime_type );

		if( $mime[ 0 ] == 'image' ) {
			if( $meta_data[ 'sizes' ] ) {
				foreach( $meta_data[ 'sizes' ] as $media_size ) {
					$file_paths[] = str_replace( $file_name, $media_size['file'], $attached_file );
				}
			}
		}

		$file_ids[] = $post->ID;
	}

	sort( $file_paths );

	$file_content = '';
	$fp = fopen( $curr_dir . "/file-paths.txt","wb");

	foreach( $file_paths as $file_path ){
		$file_content .= $file_path . PHP_EOL;
	}

	echo $file_content;

	fwrite( $fp,$file_content );
	fclose( $fp );
}