Use gd image verification code to generate and save in php

<code><span><span><?php </span><span>//画画布</span><span>$img</span> = imagecreatetruecolor(<span>100</span>, <span>40</span>);
<span>//三种颜色</span><span>$black</span> = imagecolorallocate(<span>$img</span>, <span>0x00</span>, <span>0x00</span>, <span>0x00</span>);
<span>$green</span> = imagecolorallocate(<span>$img</span>, <span>0x00</span>, <span>0xFF</span>, <span>0x00</span>);
<span>$white</span> = imagecolorallocate(<span>$img</span>, <span>0xFF</span>, <span>0xFF</span>, <span>0xFF</span>);
<span>//填充白色</span>
imagefill(<span>$img</span>,<span>0</span>,<span>0</span>,<span>$white</span>);
<span>//生成随机的验证码</span><span>$code</span> = <span>''</span>;
<span>for</span>(<span>$i</span> = <span>0</span>; <span>$i</span> 4</span>; <span>$i</span>++) {
    <span>$code</span> .= rand(<span>0</span>, <span>9</span>);
}
imagestring(<span>$img</span>, <span>5</span>, <span>10</span>, <span>10</span>, <span>$code</span>, <span>$black</span>);
<span>//加入噪点干扰</span><span>for</span>(<span>$i</span>=<span>0</span>;<span>$i</span>50</span>;<span>$i</span>++) {
    imagesetpixel(<span>$img</span>, rand(<span>0</span>, <span>100</span>) , rand(<span>0</span>, <span>100</span>) , <span>$black</span>);
    imagesetpixel(<span>$img</span>, rand(<span>0</span>, <span>100</span>) , rand(<span>0</span>, <span>100</span>) , <span>$green</span>);
}
<span>//png输出验证码jpeg输出到当前文件夹</span>
header(<span>"content-type: image/png"</span>);
imagepng(<span>$img</span>);
imagejpeg(<span>$img</span>, <span>"./ok.jpeg"</span>, <span>75</span>);
imagedestroy(<span>$img</span>);

```<span><?php </span><span>//画画布</span><span>$img</span> = imagecreatetruecolor(<span>100</span>, <span>40</span>);
<span>//三种颜色</span><span>$black</span> = imagecolorallocate(<span>$img</span>, <span>0x00</span>, <span>0x00</span>, <span>0x00</span>);
<span>$green</span> = imagecolorallocate(<span>$img</span>, <span>0x00</span>, <span>0xFF</span>, <span>0x00</span>);
<span>$white</span> = imagecolorallocate(<span>$img</span>, <span>0xFF</span>, <span>0xFF</span>, <span>0xFF</span>);
<span>//填充白色</span>
imagefill(<span>$img</span>,<span>0</span>,<span>0</span>,<span>$white</span>);
<span>//生成随机的验证码</span><span>$code</span> = <span>''</span>;
<span>for</span>(<span>$i</span> = <span>0</span>; <span>$i</span> 4</span>; <span>$i</span>++) {
    <span>$code</span> .= rand(<span>0</span>, <span>9</span>);
}
imagestring(<span>$img</span>, <span>5</span>, <span>10</span>, <span>10</span>, <span>$code</span>, <span>$black</span>);
<span>//加入噪点干扰</span><span>for</span>(<span>$i</span>=<span>0</span>;<span>$i</span>50;<span>$i</span>++) {
    imagesetpixel(<span>$img</span>, rand(<span>0</span>, <span>100</span>) , rand(<span>0</span>, <span>100</span>) , <span>$black</span>);
    imagesetpixel(<span>$img</span>, rand(<span>0</span>, <span>100</span>) , rand(<span>0</span>, <span>100</span>) , <span>$green</span>);
}
<span>//png输出验证码jpeg输出到当前文件夹</span>
header(<span>"content-type: image/png"</span>);
imagepng(<span>$img</span>);
imagejpeg(<span>$img</span>, <span>"./ok.jpeg"</span>, <span>75</span>);
imagedestroy(<span>$img</span>);</code>

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The above introduces the use of gd image verification code generation and saving in PHP, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.