PHP imagettftext()-什么都没有显示 [英] PHP imagettftext() - nothing is displaying

问题描述

尝试使用GD库显示字体.确实有一个图像，只是没有任何显示.

Trying to display a font using the GD library. There is indeed an image there, it's just that theres nothing displaying.

PHP:

header('Content-Type: image/png');

$font = $_GET['font'];

// Create the image
$image = imagecreatetruecolor(400, 30);

// Create some colors
$white = imagecolorallocate($image, 255, 255, 255);
$grey = imagecolorallocate($image, 128, 128, 128);
$black = imagecolorallocate($image, 0, 0, 0);
imagefilledrectangle($image, 0, 0, 399, 29, $white);

// The text to draw
$text = 'The Quick Brown Fox Jumps over the Lazy Dog';
$font = '/Aller/' . $font;


// Add the text
imagettftext($image, 20, 0, 10, 20, $black, $font, $text);

imagepng($image);

HTML:

<img src="fontgen.php?font=Aller_Rg.ttf" alt="" />

字体驻留在fonts/Aller/Aller_Rg.tff

The font resides in fonts/Aller/Aller_Rg.tff

我在做什么错了?

推荐答案

问题似乎出在 $ font 变量上.从文档中:

The problem seems to be the $font variable. From the documentation:

取决于PHP使用的GD库版本，如果fontfile不是以前导/开头，则.ttf将附加到文件名，并且库将尝试沿着库定义的字体路径搜索该文件名.

Depending on which version of the GD library PHP is using, when fontfile does not begin with a leading / then .ttf will be appended to the filename and the library will attempt to search for that filename along a library-defined font path.

当使用低于2.0.18的GD库版本时，空格字符(而不是分号)被用作不同字体文件的路径分隔符".意外使用此功能将导致出现警告消息:警告:找不到/打开字体.对于这些受影响的版本，唯一的解决方案是将字体移动到不包含空格的路径.

When using versions of the GD library lower than 2.0.18, a space character, rather than a semicolon, was used as the 'path separator' for different font files. Unintentional use of this feature will result in the warning message: Warning: Could not find/open font. For these affected versions, the only solution is moving the font to a path which does not contain spaces.

在许多情况下，字体与使用该脚本的脚本位于同一目录中，以下技巧可减轻任何包含问题.

In many cases where a font resides in the same directory as the script using it the following trick will alleviate any include problems.

<?php
// Set the enviroment variable for GD
putenv('GDFONTPATH=' . realpath('.'));

// Name the font to be used (note the lack of the .ttf extension)
$font = 'SomeFont';
?>

您还说过，该字体位于 fonts/Aller/目录中.而在您的脚本中，没有对 fonts 目录的引用.

You also said that the font resides in fonts/Aller/ directory. Whereas, in your script, there is no reference to the fonts directory.

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