themes/svg_gradient.php

   1 <?php
   2 header('Content-Type: image/svg+xml');
   3 header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 3600) . ' GMT');
   4
   5 function get_color($get_name, $default)
   6 {
   7     // get color from GET args, only alphanumeric chcracters
   8     $opts = array('options' => array('regexp' => '/^[a-z0-9]+$/i'));
   9     $color = filter_input(INPUT_GET, $get_name, FILTER_VALIDATE_REGEXP, $opts);
  10     if (preg_match('/^[a-f0-9]{6}$/', $color)) {
  11         return '#' . $color;
  12     }
  13     return $color ? $color : $default;
  14 }
  15 ?>
  16 <?php echo '<?xml version="1.0" ?>' ?>
  17 <svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="none" version="1.0" width="100%" height="100%">
  18     <defs>
  19         <linearGradient id="linear-gradient" x1="0%" y1="0%" x2="0%" y2="100%">
  20             <stop offset="0%" stop-color="<?php echo get_color('from', 'white') ?>" stop-opacity="1" />
  21             <stop offset="100%" stop-color="<?php echo get_color('to', 'black') ?>" stop-opacity="1" />
  22         </linearGradient>
  23     </defs>
  24     <rect width="100%" height="100%" style="fill:url(#linear-gradient);" />
  25 </svg>