In this tutorial, I am going to show you how can you change date format in PHP. You can use PHP default functions to change the date format. I am going to use strtotime() date() 
strtotime ( string $time [, int $now = time() ] ) : int
date ( string $format [, int $timestamp = time() ] ) : string
 Change YYYY-MM-DD to MM-DD-YYYY 
Mysql  default date format is Year-Month-Date  that is why every PHP developer has with a problem.
<?php
$date		= 	"2019-02-08";
$newDate1 	= 	date("m-d-Y", strtotime($date));
$newDate2 	= 	date("l M, d, Y", strtotime($date));
?>
 The output will be. You can change the format as per your need for that you need to change the format character listed below.
echo $newDate1;
08-02-2019 //Output
echo $newDate2;
Friday Feb, 08, 2019 //Output
 You can change date format with the help of explode() 
$date		=	'2019-02-08';
$arr		=	explode('-',$date);
$newDate	=	$arr[2].'-'.$arr[1].'-'.$arr[0];
 The output will be.
echo $newDate;
08-02-2019 //Output