imageloadfont

    (PHP 4, PHP 5, PHP 7, PHP 8)

    imageloadfont — Load a new font

    Description

    imageloadfont(string $filename): GdFont|false

    imageloadfont() loads a user-defined bitmap and returns its identifier.

    Parameters

    filename

    The font file format is currently binary and architecture dependent. This means you should generate the font files on the same type of CPU as the machine you are running PHP on.

    Font file format
    byte position C data type description
    byte 0-3 int number of characters in the font
    byte 4-7 int value of first character in the font (often 32 for space)
    byte 8-11 int pixel width of each character
    byte 12-15 int pixel height of each character
    byte 16- char array with character data, one byte per pixel in each character, for a total of (nchars*width*height) bytes.

    Return Values

    Returns an GdFont instance, or false on failure.

    Changelog

    Version Description
    8.1.0 Returns an GdFont instance now; previously, an int was returned.

    Examples

    Example #1 imageloadfont() usage example

    <?php
    // Create a new image instance
    $im = imagecreatetruecolor(50, 20);
    $black = imagecolorallocate($im, 0, 0, 0);
    $white = imagecolorallocate($im, 255, 255, 255);

    // Make the background white
    imagefilledrectangle($im, 0, 0, 49, 19, $white);

    // Load the gd font and write 'Hello'
    $font = imageloadfont('./04b.gdf');
    imagestring($im, $font, 0, 0, 'Hello', $black);

    // Output to browser
    header('Content-type: image/png');

    imagepng($im);
    ?>

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    User Contributed Notes 3 notes

    up
    5
    siker at norwinter dot com
    19 years ago
    Working under the assumption that the only 'architecture dependant' part of the font files is endianness, I wrote a quick and dirty Python script to convert between the two. It has only been tested on a single font on a single machine so don't bet your life on it working. All it does is swap the byte order of the first four ints.#!/usr/bin/env pythonf = open("myfont.gdf", "rb");d = open("myconvertedfont.gdf", "wb");for i in xrange(4):        b = [f.read(1) for j in xrange(4)];        b.reverse();        d.write(''.join(b));d.write(f.read());I successfully used this script to convert anonymous.gdf, from one of the font links below, into something useable on Mac OS X.
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    1
    alex at bestgames dot ro
    20 years ago
    Confirmation code generation for preventing automated registrations on a website.Function arguments are:$code - the code that you shall random generate$location - relative location of the image that shall be generated$fonts_dir - relative location for the GDF fonts directoryThis function will create an image with the code given by you and will save it in the directory specified with the name formed by MD5 hash of the code.You may insert as many font types in the fonts directory as you wish, with random names.<?phpfunction generate_image($code, $location, $fonts_dir){     $image  = imagecreate(150, 60);                imagecolorallocate($image, rand(0, 100), rand(100, 150), rand(150, 250));     $fonts = scandir($fonts_dir);          $max = count($fonts) - 2;          $width = 10;     for ($i = 0; $i <= strlen($code); $i++)     {              $textcolor = imagecolorallocate($image, 255, 255, 255);         $rand = rand(2, $max);         $font = imageloadfont($fonts_dir."/".$fonts[$rand]);                  $fh = imagefontheight($font);         $fw = imagefontwidth($font);         imagechar($image, $font, $width, rand(10, 50 - $fh), $code[$i], $textcolor);               $width = $width + $fw;             }                  imagejpeg($image, $location."/".md5($code).".jpg", 100);     imagedestroy($image);                return $code;     }?>
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    0
    matthew at exanimo dot com
    19 years ago
    Remember - GD fonts aren't antialiased.  If you're planning on using a pre-existing (TrueType) font, you may want to consider using imagettftext() instead of phillip's function.
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