有没有一种方法（bundle或其他方法）可以以图像格式显示（转换）文本。
from a text .txt input => output : display it on .png
您可以使用php本机函数imagestring、imagettftext甚至imagik（需要激活GD php扩展），例如imagettftext（来自php帮助页面）：
<?php
// Set the content-type
header('Content-type: image/png');
// Create the image
$im = imagecreatetruecolor(400, 30);
// Create some colors
$white = imagecolorallocate($im, 255, 255, 255);
$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 399, 29, $white);
// The text to draw
$text = 'Testing...';
// Replace path by your own font path
$font = 'arial.ttf';
// Add some shadow to the text
imagettftext($im, 20, 0, 11, 21, $grey, $font, $text);
// Add the text
imagettftext($im, 20, 0, 10, 20, $black, $font, $text);
// Using imagepng() results in clearer text compared with imagejpeg()
imagepng($im);
imagedestroy($im);
?>
首先为特定控制器创建一个路由，然后在该控制器中添加以下代码
/**
* Action returns an image which is generated from
* given request text input
* @param type $text
* @return 'Symfony'Component'HttpFoundation'Response
*/
public function textToImageAction($text) {
$filename = $this->saveTextAsImage($text);
$response = new Response();
// Set headers
$response->headers->set('Cache-Control', 'private');
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition', 'attachment; filename="' . basename($filename) . '";');
$response->headers->set('Content-length', filesize($filename));
// Send headers before outputting anything
$response->sendHeaders();
$response->setContent(readfile($filename));
return $response;
}
/**
* Method convert given text to PNG image and returs
* file name
* @param type $text Text
* @return string File Name
*/
public function saveTextAsImage($text) {
// Create the image
$imageCreator = imagecreatetruecolor(100, 30);
// Create some colors
$white = imagecolorallocate($imageCreator, 255, 255, 255);
$grey = imagecolorallocate($imageCreator, 128, 128, 128);
$black = imagecolorallocate($imageCreator, 0, 0, 0);
imagefilledrectangle($imageCreator, 0, 0, 399, 29, $white);
$font = 'arial.ttf';
// Add some shadow to the text
imagettftext($imageCreator, 20, 0, 11, 21, $grey, $font, $text);
// Add the text
imagettftext($imageCreator, 20, 0, 10, 20, $black, $font, $text);
// Using imagepng() results in clearer text compared with imagejpeg()
$file_name = "upload/text_image.png";
imagepng($imageCreator, $file_name);
imagedestroy($imageCreator);
return $file_name;
}