PHP中将远程图片URL转换为Base64编码的优化方案

$path = 'https://projectstaging.s3.ap-southeast-2.amazonaws.com/2ade1776f74aa967de6578bbbceca692c274aced.png';
$type = pathinfo($path, PATHINFO_EXTENSION);
$data = file_get_contents($path);
if ($data === false) {
    // 处理获取失败的情况
    echo "无法获取图片内容。\n";
    exit;
}
$base64 = 'data:image/' . $type . ';base64,' . base64_encode($data);
echo $base64;

<?php

namespace App\Helpers;

use Illuminate\Support\Facades\Http;
use Exception;

class ImageConverter
{
    /**
     * 将远程图片URL转换为Base64编码的Data URI。
     *
     * @param string $url 远程图片的URL。
     * @return string|null 返回Base64编码的Data URI，或在失败时返回null。
     */
    public static function convertImagetoBase64(string $url): ?string
    {
        try {
            // 1. 从URL中获取文件扩展名
            $urlParts = pathinfo($url);
            $extension = $urlParts['extension'] ?? null;

            if (empty($extension)) {
                // 尝试从HTTP响应头中获取Content-Type，进而推断扩展名
                $response = Http::head($url); // 发送HEAD请求获取头信息
                if ($response->successful()) {
                    $contentType = $response->header('Content-Type');
                    if ($contentType && str_starts_with($contentType, 'image/')) {
                        $extension = explode('/', $contentType)[1];
                    }
                }
            }

            if (empty($extension)) {
                // 无法确定图片类型，返回null或抛出异常
                error_log("无法确定图片类型: " . $url);
                return null;
            }

            // 2. 使用HTTP客户端获取图片内容
            $response = Http::timeout(10)->get($url); // 设置10秒超时

            if ($response->successful()) {
                $imageData = $response->body();
                // 3. Base64编码并构建Data URI
                return 'data:image/' . $extension . ';base64,' . base64_encode($imageData);
            } else {
                // 处理HTTP请求失败的情况
                error_log("获取图片失败，URL: {$url}, 状态码: {$response->status()}");
                return null;
            }
        } catch (Exception $e) {
            // 捕获网络连接、DNS解析等异常
            error_log("转换图片到Base64时发生异常: " . $e->getMessage() . " URL: " . $url);
            return null;
        }
    }
}

// 示例用法：
$imageUrl = 'https://snapformsstaging.s3.ap-southeast-2.amazonaws.com/80f1d508b80a16f7b114009c62a2794ff45a84b6.png';
$base64Txt = ImageConverter::convertImagetoBase64($imageUrl);

if ($base64Txt) {
    echo "Base64编码图片:\n";
    echo substr($base64Txt, 0, 100) . "...\n"; // 只显示前100个字符
    // 在HTML中可以直接使用：<img src="<?php echo $base64Txt; ?>">
} else {
    echo "图片转换失败。\n";
}

// Guzzle示例（需要通过Composer安装：composer require guzzlehttp/guzzle）
use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;

function convertImagetoBase64WithGuzzle(string $url): ?string
{
    $client = new Client(['timeout' => 10]); // 设置超时

    try {
        $urlParts = pathinfo($url);
        $extension = $urlParts['extension'] ?? null;

        if (empty($extension)) {
            // 尝试通过HEAD请求获取Content-Type
            $headResponse = $client->head($url);
            if ($headResponse->getStatusCode() === 200) {
                $contentType = $headResponse->getHeaderLine('Content-Type');
                if ($contentType && str_starts_with($contentType, 'image/')) {
                    $extension = explode('/', $contentType)[1];
                }
            }
        }

        if (empty($extension)) {
            error_log("无法确定图片类型: " . $url);
            return null;
        }

        $response = $client->get($url);

        if ($response->getStatusCode() === 200) {
            $imageData = $response->getBody()->getContents();
            return 'data:image/' . $extension . ';base64,' . base64_encode($imageData);
        } else {
            error_log("获取图片失败，URL: {$url}, 状态码: {$response->getStatusCode()}");
            return null;
        }
    } catch (RequestException $e) {
        error_log("Guzzle请求异常: " . $e->getMessage() . " URL: " . $url);
        return null;
    } catch (Exception $e) {
        error_log("转换图片到Base64时发生异常: " . $e->getMessage() . " URL: " . $url);
        return null;
    }
}