php[tek] 2017: Atlanta

PNG creation with PHP

Przykład #1 PNG creation with PHP

<?php

header
("Content-type: image/png");
$string $_GET['text'];
$im     imagecreatefrompng("images/button1.png");
$orange imagecolorallocate($im22021060);
$px     = (imagesx($im) - 7.5 strlen($string)) / 2;
imagestring($im3$px9$string$orange);
imagepng($im);
imagedestroy($im);

?>
This example would be called from a page with a tag like: <img src="button.php?text=text">. The above button.php script then takes this "text" string and overlays it on top of a base image which in this case is "images/button1.png" and outputs the resulting image. This is a very convenient way to avoid having to draw new button images every time you want to change the text of a button. With this method they are dynamically generated.

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User Contributed Notes 3 notes

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2
viishalkumarsahu at gmail dot com
1 month ago
Function to create random png images when requested for example...
<img src="create_image.php?s=008080_F_1000_200&t=Sample%20Image%20Drawn%20By%20PHP" alt="GD Library Example Image" >

here is create_image.php
<?php
$setting
= isset($_GET['s']) ? $_GET['s'] : "FFF_111_100_100";
$setting = explode("_",$setting );
$img = array();

switch (
$n = count($setting)) {
    case
$n > 4 :
    case
3:
       
$setting[3] = $setting[2];
    case
4:
       
$img['width'] = (int) $setting[2];
       
$img['height'] = (int) $setting[3];
    case
2:
       
$img['color'] = $setting[1];
       
$img['background'] = $setting[0];
        break;
    default:
        list(
$img['background'],$img['color'],$img['width'],$img['height']) = array('F','0',100,100);
        break;
}

$background = explode(",",hex2rgb($img['background']));
$color = explode(",",hex2rgb($img['color']));
$width = empty($img['width']) ? 100 : $img['width'];
$height = empty($img['height']) ? 100 : $img['height'];
$string = (string) isset($_GET['t']) ? $_GET['t'] : $width ."x". $height;

header("Content-Type: image/png");
$image = @imagecreate($width, $height)
    or die(
"Cannot Initialize new GD image stream");

$background_color = imagecolorallocate($image, $background[0], $background[1], $background[2]);
$text_color = imagecolorallocate($image, $color[0], $color[1], $color[2]);

imagestring($image, 5, 5, 5, $string, $text_color);
imagepng($image);
imagedestroy($image);

function
hex2rgb($hex) {
   
// Copied
  
$hex = str_replace("#", "", $hex);

   switch (
strlen($hex)) {
       case
1:
          
$hex = $hex.$hex;
       case
2:
         
$r = hexdec($hex);
         
$g = hexdec($hex);
         
$b = hexdec($hex);
           break;

       case
3:
         
$r = hexdec(substr($hex,0,1).substr($hex,0,1));
         
$g = hexdec(substr($hex,1,1).substr($hex,1,1));
         
$b = hexdec(substr($hex,2,1).substr($hex,2,1));
           break;

       default:
         
$r = hexdec(substr($hex,0,2));
         
$g = hexdec(substr($hex,2,2));
         
$b = hexdec(substr($hex,4,2));
           break;
   }

  
$rgb = array($r, $g, $b);
   return
implode(",", $rgb);
}
up
-42
Anonymous
10 months ago
too low too hard for use !

    $fontsize = mt_rand(18,23);
    //mt_rand(6,9): F5刷新会抖动!
    //$fontsize = 9;
up
-110
Jeff
1 year ago
Keep in mind that transparency is not preserved when doing what is shown in Example #1 to a PNG with transparency.
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