不使用TrueType字体显示条形码的PHP函数

Question

你好，我正在使用我在互联网上找到的一个函数来显示一个使用TrueType字体的barCode，代码如下：

//For displaying barcodes

//Arguments are:
//  code    Number you want outputted as a barcode

//You can use this script in two ways:
//  From a webpage/PHP script   <img src='/images/barcode.php?code=12345'/>
//  Directly in your web browser    http://www.example.com/images/barcode.php?code=12345

//Outputs the code as a barcode, surrounded by an asterisk (as per standard)
//Will only output numbers, text will appear as gaps
//Image width is dynamic, depending on how much data there is


header("Content-type: image/png");
$file = "barcode.png"; // path to base png image
$im = imagecreatefrompng($file); // open the blank image
$string = "123123123"; // get the code from URL
imagealphablending($im, true); // set alpha blending on
imagesavealpha($im, true); // save alphablending setting (important)

$black = imagecolorallocate($im, 0, 0, 0); // colour of barcode

$font_height=40; // barcode font size. anything smaller and it will appear jumbled and will not be able to be read by scanners

$newwidth=((strlen($string)*20)+41); // allocate width of barcode. each character is 20px across, plus add in the asterisk's
$thumb = imagecreatetruecolor($newwidth, 40); // generate a new image with correct dimensions

imagecopyresized($thumb, $im, 0, 0, 0, 0, $newwidth, 40, 10, 10); // copy image to thumb
imagettftext($thumb, $font_height, 0, 1, 40, $black, 'B2FI25HRc.ttf', '*'.$string.'*'); // add text to image

//show the image
imagepng($thumb);
imagedestroy($thumb);

我找不到为什么函数不能显示图像的错误。有什么想法吗？字体与php函数在同一目录中，我尝试了字体的相对路径和绝对路径，但没有结果。有什么建议吗？

非常感谢

Answer 1

您需要检查错误消息。为了调试，注释掉标题行，并在顶部添加以下行，以显示所有错误：

ini_set('display_errors',true);
error_reporting(E_ALL);

在许多情况下，错误消息会很清楚地告诉您出了什么问题。