Detailed explanation of the specific steps to create images in PHP

PHP image processing is the most common in verification codes. Here are the specific steps to create images using PHP.

Brief description: PHP is not limited to creating HTML output, it can also create and process images in a variety of formats including ,,,, and . Even more conveniently, PHP can directly output the image data stream to the browser. To use image processing functions in PHP, you need to compile PHP with libraries. libraries and PHP may require other libraries, depending on the image format you want to handle.

You can use the image functions in PHP to get images in the following formats: ,,,, and.

Step instructions: Please check the php manual for specific function description

<?php

//第一：设定标头，告诉浏览器你要生成的MIME 类型
header("Content-type: image/png");
//第二：创建一个画布，以后的操作都将基于此画布区域     
$codew = 100;
$codeh = 60;
$codeimg = imagecreatetruecolor($codew, $codeh);

//获取画布颜色
$red = imagecolorallocate($codeimg, 255, 0, 0);
$white = imagecolorallocate($codeimg, 255, 255, 255);
$green = imagecolorallocate($codeimg, 75, 222, 26);
//第三：填充画布背景颜色
imagefill($codeimg, 0, 0, $red);

//第四：绘制线条 + 填充文字...
imageline($codeimg, 0, 00, 30, 60, $white);
imageline($codeimg, 0, 00, 50, 60, $white);
imageline($codeimg, 0, 00, 80, 60, $white);

//填充文字
imagestring($codeimg, 10, 30, 30, "qwe4", $green);

//第五：输出创建的画布
imagepng($codeimg);

//第六：销毁画布
imagedestroy($codeimg);

?>

 效果查看

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