- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$Input = "08/12/2017";
if(date("l", strtotime($Input)) == "Saturday"){
$Saturday = strtotime($Input);
}else{
$Saturday = strtotime($Input . " previous saturday");
}
$Friday = strtotime(date("m/d/Y", $Saturday) . " next friday");
echo date("m/d/Y", $Saturday) . " to " . date("m/d/Y", $Friday);