PHP添加孟加拉语文本至图片时字体显示异常，求解决方案

I see the core issue immediately—those unnecessary encoding conversions are mangling your Bengali text. Let's fix this step by step:

The Problem with Your Current Code #

The lines below are converting your valid UTF-8 Bengali text to ISO-8859-1, which doesn’t support Bengali characters. This is why your text shows up broken:

$text = mb_convert_encoding($text, 'HTML-ENTITIES',"UTF-8"); 
$text = html_entity_decode($text,ENT_NOQUOTES, "ISO-8859-1"); 

Corrected Code #

Here’s the cleaned-up version that preserves your Bengali text and renders it correctly:

mb_internal_encoding('UTF-8'); 
header('Content-type: image/jpeg'); 

// Load your base certificate image
$our_image = imagecreatefromjpeg('certificates/main.jpg'); 

// Define text color (black)
$black_color = imagecolorallocate($our_image, 0, 0, 0); 

// Use a valid Bengali font (ensure the path is correct!)
$font_path = 'SolaimanLipi_29-05-06.ttf'; // Adjust path to match your font's location

// Your Bengali text (keep it in UTF-8)
$text = 'সৌরভ দাস'; 

// Text rendering parameters
$font_size = 50; 
$angle = 0; 
$left = 1500; 
$top = 1400; 

// Render the text to the image
$output = imagettftext($our_image, $font_size, $angle, $left, $top, $black_color, $font_path, $text); 

// Save the final certificate
$imgName = "BDCH-Certificate-maper-".$uid.".jpg"; 
imagejpeg($our_image, 'certificates/'.$imgName);

// Clean up memory resources
imagedestroy($our_image);

Additional Troubleshooting Steps #

If the text still doesn’t render correctly, check these common issues:

• Font Path: Ensure the font file is in the right location relative to your PHP script. Use an absolute path (like /var/www/html/fonts/SolaimanLipi_29-05-06.ttf) to avoid path confusion.
• FreeType Support: Confirm your GD library has FreeType enabled. Run phpinfo() and look for "FreeType Support" under the GD section—it should say "enabled".
• Font Compatibility: Stick to well-tested Bengali fonts like SolaimanLipi, Kalpurush (UTF-8 version), or Nikosh. Avoid ANSI-encoded fonts, as they don’t support full UTF-8 Bengali characters.
• UTF-8 Validation: Verify your input text is valid UTF-8 using mb_check_encoding($text, 'UTF-8') to rule out corrupted text.

This should resolve the broken text issue. Let me know if you run into any other hurdles!

内容的提问来源于stack exchange，提问作者Sourav Das