Created
November 23, 2012 11:12
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PHP image resizer
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| <?php | |
| /* | |
| This works like a callable url to embed in img tag that returns a jpeg image | |
| resized proportionally and/or cropped accordingly to "width" and "height" parameters | |
| Usage: resize.php?image=images/my-kitten-image.jpg&width=200&height=100 | |
| */ | |
| $filename = $_GET['image']; | |
| $new_w = $_GET['width']; | |
| $new_h = $_GET['height']; | |
| list($image_w, $image_h) = getimagesize($filename); | |
| if (empty($new_w) && empty($new_h)) { $new_w = $image_w; $new_h = $image_h; } | |
| $image_ratio = $image_w / $image_h; | |
| if (empty($new_w)) { $new_w = $new_h * $image_ratio; } | |
| if (empty($new_h)) { $new_h = $new_w / $image_ratio; } | |
| $new_ratio = $new_w / $new_h; | |
| $margin_x = $margin_y = 0; | |
| $cropped_w = $image_w; | |
| $cropped_h = $image_h; | |
| if ($new_ratio >= $image_ratio) { | |
| // l'immagine richiesta è più larga | |
| $cropped_h = $image_w / $new_ratio; | |
| $margin_y = $image_h - $cropped_h; | |
| } else { | |
| // l'immagine richiesta è più alta | |
| $cropped_w = $image_h * $new_ratio; | |
| $margin_x = $image_w - $cropped_w; | |
| } | |
| $image_p = imagecreatetruecolor($new_w, $new_h); | |
| $image = imagecreatefromjpeg($filename); | |
| imagecopyresampled($image_p, $image, 0, 0, $margin_x / 2, $margin_y / 2, $new_w, $new_h, $cropped_w, $cropped_h); | |
| Header ("Content-type: image/jpeg"); | |
| imagejpeg($image_p, null, 80); | |
| ?> |
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This works like a callable url to embed in img tag that returns a jpeg image resized proportionally and/or cropped accordingly to "width" and "height" parameters.
Usage: resize.php?image=images/my-kitten-image.jpg&width=200&height=100