What to do if the canvas created in php is garbled

Solution to garbled canvas created in PHP

In the process of using PHP to create a canvas, we often encounter the problem of Chinese garbled characters. This problem is often caused by the inconsistency between PHP's default character set and the character set of the web page. Below we'll cover two common solutions.

Method 1: Use the iconv function to convert character encoding

The iconv() function can convert a string from one character encoding to another. Before creating the canvas, you can use the iconv() function to convert the character encoding you need to use to a character encoding supported by PHP. The specific operation is as follows:

//需要使用的字符编码为UTF-8
$text = "中国";

//将字符编码转换为GB2312
$text = iconv("UTF-8", "GB2312//IGNORE", $text);

//创建画布并添加中文文本
$im = imagecreate(100, 50);
$black = imagecolorallocate($im, 0, 0, 0);
imagestring($im, 5, 0, 0, $text, $black);

//输出图片
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

The above code converts the Chinese character encoding from UTF-8 to GB2312, and then adds the encoded text to the canvas. This can avoid the problem of Chinese garbled characters.

Method 2: Specify the character set in the header of the PHP file

The header of the PHP file can specify the character set of the file. If the character set of the PHP file is consistent with the character set of the web page, when creating the canvas There will be no problem with Chinese garbled characters. The specific operation is as follows:

<?php
//指定字符集为UTF-8
header(&#39;Content-type:text/html;charset=utf-8&#39;);

//创建画布并添加中文文本
$im = imagecreate(100, 50);
$black = imagecolorallocate($im, 0, 0, 0);
$text = "中国";
imagestring($im, 5, 0, 0, $text, $black);

//输出图片
header(&#39;Content-type: image/png&#39;);
imagepng($im);
imagedestroy($im);
?>

In the above code, we specified the character set as UTF-8 in the header of the PHP file. When creating the canvas, we directly add Chinese text without character set conversion.

It should be noted that if the character set of the PHP file header and the web page are inconsistent, it will also cause the problem of Chinese garbled characters. When specifying the character set in the PHP file header, be sure to ensure that the character set in the file header is consistent with the character set of the web page.

To sum up, the above two methods can solve the problem of Chinese garbled characters in canvas created in PHP. Which method to use can be chosen based on the specific situation.

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