Question

我正在尝试从SLIM控制器显示动态生成的图像，但我得到一个空白屏幕。感谢。

public function textToImage($request, $response, $args) {

    // The text to draw
    $text = "Hello World";
    $length=strlen($text);
    // Create the image

    $im = imagecreatetruecolor($length*12, 30);

    // Create some colors
    $white = imagecolorallocate($im, 255, 255, 255);
    $grey = imagecolorallocate($im, 128, 128, 128);
    $black = imagecolorallocate($im, 44, 62, 80);
    $boxcolor=imagecolorallocate($im, 95, 128, 149);

    $font = 'Helvetica.ttf';
    imagefilledrectangle($im, 0, 0, $length*9+$capitaladjust, 29, $white);
    imagettftext($im, 13, 0, 0, 20, $black, $font, $text);

    $response->getBody()->write(base64_encode($im));
    $response = $response->withHeader('Content-type', 'image/png');     
    return $response;
 }

Answer 1

base64编码$im不会创建有效的PNG文件。尝试使用imgpng，然后发送它创建的PNG文件的原始内容。

代码看起来像这样：

ob_start();
imagepng($im);
$data = ob_get_contents();
ob_end_clean();

$response->getBody()->write($data);
$response = $response->withHeader('Content-type', 'image/png');     
return $response;

PHP SLIM：如何返回动态生成的图像

1 个答案: