Learn PHP

  <! DOCTYPE html > < html lang = "en" > < head >     < meta charset = "UTF-8" >     < meta name = "viewport" content = "width=device-width, initial-scale=1.0" >     < title >Product Filter</ title >     < link rel = "stylesheet" href = "https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css" >     < style >         #slider-range {             margin: 20 px ;         }         .price {             font-size: 16 px ;             font-weight: bold ;         }         .product-grid {             display: flex ;             flex-wrap: wrap ;             gap: 15 px ;         }         .product-item {             border: 1 px solid #ccc ;             padding: 15 px ;             width: calc ( 33.33 % - 30 px );             box-sizing: border-box ;         }         .product-item h3 {             font-size: 18 px ;             margin: 0 0 10 px ;         }

 <?php function numberToWords($num) {     $ones = array(         0 => "zero",         1 => "one",         2 => "two",         3 => "three",         4 => "four",         5 => "five",         6 => "six",         7 => "seven",         8 => "eight",         9 => "nine",         10 => "ten",         11 => "eleven",         12 => "twelve",         13 => "thirteen",         14 => "fourteen",         15 => "fifteen",         16 => "sixteen",         17 => "seventeen",         18 => "eighteen",         19 => "nineteen"     );     $tens = array(         2 => "twenty",         3 => "thirty",         4 => "forty",         5 => "fifty",         6 => "sixty",         7 => &q