PHP：使用 PHP 创建 PNG 图片 - 手册

使用 PHP 创建 PNG 图片

示例 #1 使用 PHP 创建 PNG 图片

<?php

header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button1.png");
$orange = imagecolorallocate($im, 220, 210, 60);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
imagestring($im, 3, $px, 9, $string, $orange);
imagepng($im);
imagedestroy($im);

?>

这个示例可以从包含如下标签的页面中调用：<img src="button.php?text=text">。上面的 button.php 脚本然后获取这个 "text" 字符串并将其叠加到一个基础图像上，在本例中是 "images/button1.png"，并输出生成的图像。这是一种非常方便的方式，可以避免每次想要更改按钮文本时都要绘制新的按钮图像。使用这种方法，它们是动态生成的。

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viishalkumarsahu at gmail dot com ¶

7 年前

函数在请求时创建随机的 png 图片，例如...
<img src="create_image.php?s=008080_F_1000_200&t=Sample%20Image%20Drawn%20By%20PHP" alt="GD Library Example Image" >

这是 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); 
}