<?php


	/* [0] Initialization
	=========================================================*/
	/* (1) Catch 'pictures' dir */
	$dir = dirname(__FILE__);

	/* (2) Defining authorized extensions */
	$ext = ['jpg', 'png', 'jpeg'];
	$checker = '/\.('. implode('|', $ext) .')$/i';


	/* [2] Listing all pictures recursivly
	=========================================================*/
	function getImages($directory){

		/* (1) We get the direct content of the dir */
		$files   = scandir($directory);
		$fetched = [];

		// if error
		if( !is_array($files) ) return [];


		/* (2) For each element in directory  */
		foreach( $files as $e=>$fname ){

			// {0} Avoid . and .. //
			if( in_array($fname, ['.', '..']) )
				continue;


			$element = "$directory/$fname";

			// {1} If subdir (excepted . and ..)-> applying recursivly //
			if( is_dir($element) )
				$fetched[$fname] = getImages($element);

			// {2} If not picture -> unset //
			else if( !preg_match($checker, $fname) )
				$fetched[] = $fname;

		}

		/* (3) Returning result */
		return $fetched;

	}


	/* [2] On affiche le résultat
	=========================================================*/

	header('Content-Type: application/json');
	echo json_encode( getImages($dir) );