Outputting image with underlined text using php GD library

问题

What is the best way to display underlined text and output the result as image with GD or any other library?

回答1:

You can try using the Unicode underline combining character U+0332.

<?php
// Set the content-type
header('Content-type: image/png');

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

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

// The text to draw
$text = "&#x0332;U&#x0332;d&#x0332;e&#x0332;r&#x0332;l&#x0332;i&#x0332;n&#x0332;e";
// Replace path by your own font path
$font = 'arial.ttf';


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

// Using imagepng() results in clearer text compared with imagejpeg()
imagepng($im);
imagedestroy($im);
?>

回答2:

There are lots of FREE PHP CAPTCHA out there that come with a lot of customization, download one and see what exactly happens behind the scene. Also have a look at this link

HTH

回答3:

I am using this...

    $font = imageloadfont($font_file);  
$font_width = ImageFontWidth($font);
$font_height = ImageFontHeight($font);
    $str_width = strlen($text)*$font_width;
    ImageLine($image, $left, $top+$font_height, $left+$str_width,  $top+$font_height, $color);

来源：https://stackoverflow.com/questions/692411/outputting-image-with-underlined-text-using-php-gd-library