upload image file in php

upload.php

<?php 
if (isset($_FILES['image'])) {
	$errors = array();
	$allowed_ext = array('jpg','jpeg','png','gif');

	$file_name = $_FILES['image']['name'];
	$file_ext  = strtolower(end(explode(".", $file_name)));
	$file_size = $_FILES['image']['size'];
	$file_tmp  = $_FILES['image']['tmp_name'];

	if (in_array($file_ext, $allowed_ext) === false ) {
		$errors[] = 'Extenstion not allowed';
	}
	if ($file_size > 2097152) {
		$errors[] = 'File size must be under 2mb';
	}
	if (empty($errors)) {
		if(move_uploaded_file($file_tmp, 'images/'.$file_name)){
			echo "File Uploaded";
		}
	}else{
		foreach ($errors as $error) {
			echo $error , '<br>';
		}
	}
}
?>

<form action="" method="POST" enctype="multipart/form-data">
	<p>
		<input type="file" name="image" />
		<input type="submit" value="Upload"/>
	</p>
</form>