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php实现截图功能

2026-02-15 08:03:34PHP

PHP实现截图功能的方法

使用HTML2Canvas和PHP结合

前端使用HTML2Canvas库捕获网页内容，后端PHP接收并保存图像。

// 前端代码
html2canvas(document.body).then(function(canvas) {
    var imgData = canvas.toDataURL('image/png');
    $.post('save_screenshot.php', {image: imgData}, function(response) {
        console.log(response);
    });
});

// save_screenshot.php
$imageData = $_POST['image'];
$imageData = str_replace('data:image/png;base64,', '', $imageData);
$imageData = base64_decode($imageData);
file_put_contents('screenshot.png', $imageData);
echo 'Screenshot saved successfully';

使用PHP的GD库

GD库可以处理图像，适合从现有图像创建截图。

$sourceImage = imagecreatefromjpeg('source.jpg');
$width = 200;
$height = 200;
$thumb = imagecreatetruecolor($width, $height);
imagecopyresized($thumb, $sourceImage, 0, 0, 0, 0, $width, $height, imagesx($sourceImage), imagesy($sourceImage));
imagejpeg($thumb, 'thumbnail.jpg');
imagedestroy($thumb);

使用第三方API

某些第三方服务提供截图功能，可以通过API调用。

$url = 'https://api.screenshotapi.com/capture';
$params = [
    'url' => 'https://example.com',
    'width' => 1024,
    'height' => 768
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);
file_put_contents('screenshot.png', $response);

使用无头浏览器

通过无头浏览器如Puppeteer或Selenium实现更复杂的截图。

// 需要安装Node.js和Puppeteer
$script = <<<SCRIPT
const puppeteer = require('puppeteer');
(async () => {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    await page.goto('https://example.com');
    await page.screenshot({path: 'example.png'});
    await browser.close();
})();
SCRIPT;
file_put_contents('screenshot.js', $script);
exec('node screenshot.js');