请求将Instagram图片爬取Python代码转换为PHP代码

Got it, let's convert that Instagram image scraping Python code over to PHP while keeping all the core logic intact. Here's how you can do it:

First, let's recap what the original Python code handles:

• Maintains a persistent request session to mimic browser behavior
• Uses a standard browser User-Agent to avoid being blocked
• Fetches up to 3 pages of posts from thefatfoxcamden using pagination via the max_id parameter
• Extracts the window._sharedData JSON blob from the page source
• Parses that JSON to pull out post and image details

Here's the PHP implementation that mirrors this exact logic:

<?php
$targetUser = 'thefatfoxcamden';
$profileBaseUrl = 'https://www.instagram.com/' . $targetUser;

// Initialize cURL session to preserve cookies/context (like Python's requests.session())
$curlHandle = curl_init();
curl_setopt($curlHandle, CURLOPT_USERAGENT, 'Mozilla/5.0');
curl_setopt($curlHandle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curlHandle, CURLOPT_FOLLOWLOCATION, true); // Handle any redirects

$endCursor = '';

// Loop for 3 pages (matches the original Python loop range 1-3)
for ($pageCount = 1; $pageCount <= 3; $pageCount++) {
    echo "PAGE: " . $pageCount . PHP_EOL;
    
    // Build request URL with pagination parameter if we have an end cursor
    $requestUrl = $profileBaseUrl;
    if (!empty($endCursor)) {
        $requestUrl .= '?max_id=' . urlencode($endCursor);
    }
    
    curl_setopt($curlHandle, CURLOPT_URL, $requestUrl);
    $pageResponse = curl_exec($curlHandle);
    
    // Handle cURL errors
    if ($pageResponse === false) {
        echo "cURL Error: " . curl_error($curlHandle) . PHP_EOL;
        continue;
    }
    
    // Extract the window._sharedData JSON from the page source
    preg_match('/window._sharedData = (\{.+?});<\/script>/', $pageResponse, $dataMatches);
    if (!isset($dataMatches[1])) {
        echo "Failed to extract shared data from the page" . PHP_EOL;
        continue;
    }
    
    // Decode the JSON into a PHP array
    $sharedData = json_decode($dataMatches[1], true);
    if (json_last_error() !== JSON_ERROR_NONE) {
        echo "JSON Decode Error: " . json_last_error_msg() . PHP_EOL;
        continue;
    }
    
    // Navigate to the timeline media posts
    $posts = $sharedData['entry_data']['ProfilePage'][0]['graphql']['user']['edge_owner_to_timeline_media']['edges'];
    
    // Loop through each post to get image details
    foreach ($posts as $post) {
        $postNode = $post['node'];
        // Grab the highest-resolution display image URL
        $imageUrl = $postNode['display_url'];
        // Get the post caption (fallback to "No caption" if none exists)
        $caption = isset($postNode['edge_media_to_caption']['edges'][0]['node']['text']) 
            ? $postNode['edge_media_to_caption']['edges'][0]['node']['text'] 
            : 'No caption';
        
        echo "Image URL: " . $imageUrl . PHP_EOL;
        echo "Caption: " . $caption . PHP_EOL;
        echo "---" . PHP_EOL;
    }
    
    // Get the cursor for the next page of results
    $pageInfo = $sharedData['entry_data']['ProfilePage'][0]['graphql']['user']['edge_owner_to_timeline_media']['page_info'];
    $endCursor = $pageInfo['end_cursor'];
    
    // Stop early if there are no more pages to fetch
    if (!$pageInfo['has_next_page']) {
        echo "No more pages available" . PHP_EOL;
        break;
    }
}

// Clean up the cURL session
curl_close($curlHandle);
?>

Key Details That Match the Original Python Code: #

• Persistent Session: We reuse the same cURL handle to maintain cookies and request context, just like requests.session() in Python.
• Pagination Logic: We pass the max_id parameter (using the end_cursor from each page) to fetch subsequent pages of posts.
• Data Extraction: Uses regex to pull the window._sharedData JSON blob, then decodes it to access post data.
• Loop Count: Fetches up to 3 pages, matching the original loop range.

Important Reminders: #

• Instagram's Terms of Service prohibit scraping without explicit permission. Make sure you have the right to scrape this content before running the script.
• Instagram may block your IP if you make too many requests in a short time. Consider adding delays between requests (using sleep()) or using proxies if you need to scale this.

内容的提问来源于stack exchange，提问作者Rajan