How to generate transparent images from PHP text

PHP The way to generate transparent images from text

Abstract: In current development, the function of generating images and commonly used verification code generation are often used. PHP language needs to use the GD2 function module to generate images, so basic image and graphics processing are stress-free.

Preparation:

1. Open the GD2 module and open GD2 in the php.ini file.

2. Prepare a font file suitable for linux and windows

Code:

$text = "我爱中国";//显示的文字
 
$size=16;//字体大小
 
$font="c:/windows/font/simsun.ttc";//字体文件引入
 
$img = imagecreatetruecolor(500,400);//建立一张图片，设置宽高
 
$bg = imagecolorallocatealpha($img,0,0,0,127);//设置图片透明背景
 
$color = imagecolorallocate($img,0,0,0); //设置字体颜色
 
imagealphablending($img, false);//显示透明背景
 
imagefill($img,0,0,$bg);//填充背景
 
imagefttext($img,$size,0,0,31,$color,$font,$text);
 
imagesavealpha($img,true);
 
header('Content-Type: image/png');//头信息
 
imagepng($img);//输出图片，输出png使用imagepng方法，输出gif使用imagegif方法

Extension:

If we need to set bold, we can For bold font files, you can also add the x coordinate once and draw twice, and so on to get the bold font you want.

imagefttext($img,$size,0,1,31,$color,$font,$text);

To summarize:

The common problem is that the Chinese fonts are garbled, and there seems to be no operation to set bold fonts. The direct output is a string of garbled characters, and the image can be displayed only when displayed in img src.

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