Laravel4创建一个占位图片服务例子

// vim app/routes.php
<?php
Route::pattern('width', '＼d+');
Route::pattern('height', '＼d+');
Route::get('{width}x{height}', 'ImageHolderController@getIndex');
// vim app/controllers/ImageHolderController.php
<?php

class ImageHolderController extends BaseController {
    public function getIndex($width, $height)
    {
        $width = intval($width);
        $height = intval($height);
        if ($width > 1900 || $height > 900)
            App::abort(404);
        $fontSize = min(max(intval($width / 5), 12), 38);
        $image = Image::canvas($width, $height, '#CCCCCC')
                ->line('#B5B5B5', 0, 0, $width, $height)
                ->line('#B5B5B5', $width, 0, 0, $height)
                ->text($width . 'x' . $height, $width / 2, $height / 2, function ($font) use ($fontSize) {
                    $font->file(public_path('font/Georgia.ttf'));
                    $font->align('center');
                    $font->valign('middle');
                    $font->size($fontSize);
                    $font->color('#666666');
                });
        return Response::make($image, 200, array('Content-Type' => 'image/png'));
    }
}