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Example PHP abstraction of an Image CDN. Built with CloudImage and an alias in mind, customise as your setup and provider.
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| <?php | |
| echo image([ | |
| 'image' => 'otter.jpg', | |
| 'alt' => 'an otter standing on a log looking majestic', | |
| 'srcset' => [300, 450, 600, 800, 1000, 1200], | |
| 'sizes' => '100vw', | |
| 'width' => 1200, | |
| 'height' => 800, | |
| 'loading' => 'lazy', | |
| 'class' => 'image-class' | |
| ]); |
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| <?php | |
| define( 'CDN_BASE', 'https://example.imagecdn.com' ); | |
| function image ( $args = [] ) { | |
| if ( | |
| !$args['image'] || | |
| !$args['width'] || | |
| !$args['height'] | |
| ) { | |
| return; | |
| } | |
| // set defaults here | |
| $defaults = [ | |
| 'alt' => '', | |
| 'srcset' => [ 300, 450, 600, 800, 1000, 1200 ], | |
| 'sizes' => '(min-width: 82rem) 80rem, calc(100vw - 2rem)', | |
| 'loading' => 'lazy', | |
| 'class' => false, | |
| 'picClass' => false, | |
| 'lowdpiQuality' => 80, | |
| 'hidpiQuality' => 40 | |
| ]; | |
| $opts = array_merge( $defaults, $args ); | |
| $src = '/cdn/' . $args['image']; | |
| $fallback = create_src( | |
| $src, | |
| $opts['srcset'][count($opts['srcset']) - 1], | |
| $opts['lowdpiQuality'] | |
| ); | |
| $srcset = create_srcset( $src, $opts['srcset'], $opts['lowdpiQuality'] ); | |
| $hidpi_srcset = create_srcset( $src, $opts['srcset'], $opts['hidpiQuality'] ); | |
| $markup = sprintf( | |
| '<picture %s> | |
| <source media="(-webkit-min-device-pixel-ratio: 1.5)" srcset="%s" sizes="%s"> | |
| <img %s alt="%s" src="%s" srcset="%s" sizes="%s" width="%s" height="%s" loading="%s" decoding="async"> | |
| </picture>', | |
| $opts['picClass'] ? ('class="' . $opts['picClass'] . '"') : '', | |
| $hidpi_srcset, | |
| $opts['sizes'], | |
| $opts['class'] ? ('class="' . $opts['class'] . '"') : '', | |
| $opts['alt'], | |
| $fallback, | |
| $srcset, | |
| $opts['sizes'], | |
| $opts['width'], | |
| $opts['height'], | |
| $opts['loading'] | |
| ); | |
| return $markup; | |
| } | |
| // customise this function depending on your image CDN and setup | |
| function create_src ( $path, $width, $quality ) { | |
| return CDN_BASE . $path . '?w=' . $width . '&q=' . $quality; | |
| } | |
| function create_srcset( $path, $widths, $quality ) { | |
| $srcset_arr = []; | |
| foreach ($widths as $width) { | |
| $url = create_src( $path, $width, $quality ); | |
| $srcset_arr[] = $url . ' ' . $width . 'w'; | |
| } | |
| return implode( ',', $srcset_arr ); | |
| } |
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