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In PHP, the imagestring function is used to draw text on an image. However, in certain cases, when using Chinese or other non-ASCII characters directly, text corruption may occur. This happens because the imagestring function only supports single-byte characters encoded in ISO-8859-1, while Chinese characters are multi-byte characters.

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Common Solutions

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1. Use the mb_convert_encoding function for encoding conversion: Before drawing Chinese characters, convert the string from UTF-8 to GB2312. For example:
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</span></span><span><span>$text</span></span><span> = 'Chinese Test';<br>
</span><span><span>$text</span></span><span> = mb_convert_encoding($text, 'GB2312', 'UTF-8');<br>
imagestring($image, 5, 10, 10, $text, $color);<br>

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2. Use the imagettftext function instead of imagestring: imagettftext supports TrueType fonts and can correctly display Chinese characters. For example:
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$font = 'path/to/your/font.ttf';<br>
$text = 'Chinese Test';<br>
imagettftext($image, 20, 0, 10, 50, $color, $font, $text);<br>

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3. Ensure the image and browser output encoding match: Before outputting the image, set the appropriate header, for example:
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header('Content-Type: image/png');<br>

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In conclusion, the key to solving the imagestring Chinese text corruption issue is: imagestring does not support multi-byte characters. Therefore, it is recommended to use imagettftext along with an appropriate font file.

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