Create the html for multiple file upload.The form action would go to the "uploads.php" file. 

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select Files:
    <input name="blogimg[]" type="file"/><br />
	<input name="blogimg[]" type="file" /><br />
	<input name="blogimg[]" type="file" /><br />
	<input name="blogimg[]" type="file" /><br />
    <input type="submit" value="Upload Bulk Images" name="submit">
</form>

Create a target folder to store files and a php file ie. upload.php.Here the target folder created as 'uploads' under root directory.

<?php
$target_dir = "uploads/";
if(isset($_POST["submit"])) {
	/*  Start of Re-arangement of Single array coming from Post */
	function arrngTomultarr(&$values) {
		$multi_ary = array();
		$val_count = count($values['name']);
		$val_keys = array_keys($values);

		for ($i=0; $i<$val_count; $i++) {
		    foreach ($val_keys as $key) {
		        $multi_ary[$i][$key] = $values[$key][$i];
		    }
		}
		return $multi_ary;
	}
	/*  End of Re-arangement of Single array coming from Post */
 	$multiarr_arrnged = arrngTomultarr($_FILES['blogimg']);
	/*  Start of Uploading images of multi-array after rearrangement */
	foreach ($multiarr_arrnged as $result) {  
		$name = $result['name'];
		if( !empty($name)){     // Check For Empty Values 
			$tmprary_name = $result['tmp_name'];
			$temp = explode(".", $name);
			$newfilename = uniqid(). '.' . end($temp);

			if (move_uploaded_file($tmprary_name , $target_dir.$newfilename)) {
				echo "The file ". basename( $name). " has been uploaded.<BR/>";
			} else {
				echo "Sorry, there was an error uploading your file.<br/>";
			}
		}
	}
	/*  End of Uploading images of multiarray after rearrangement */
}

The file names will be unique so there is no need to check file existence  and the empty selection will be discarded.