以下由Laravel教學專欄為大家介紹如何使用Laravel-snappy匯出PDF，希望對需要的朋友有幫助！
前言
論壇裡有很多關於如何使用Laravel-snappy 的文章，但是很多都停留在安裝、基本範例，對於實際的應用既沒有說明用法，也沒有解答一些問題和疑惑，因此在此整理一下，權當做個記錄吧。
安裝
以ubuntu 為例
1.執行安裝wkhtmltopdf：
composer require h4cc/wkhtmltopdf-amd64 0.12.x
composer require h4cc/wkhtmltoimage-amd64 0.12.x
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顧名思義，分別安裝的是wkhtmltopdf 和wkhtmltoimage。
2. 複製wkhtmltopdf 到ubuntu 執行指令的目錄中
sudo cp vendor/h4cc/wkhtmltoimage-amd64/bin/wkhtmltoimage-amd64 /usr/local/bin/
sudo cp vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64 /usr/local/bin/
//并使其可执行：
sudo chmod +x /usr/local/bin/wkhtmltoimage-amd64
sudo chmod +x /usr/local/bin/wkhtmltopdf-amd64
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3. 安裝laravel-snappy
composer require barryvdh/laravel-snappy
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4. 將ServiceProvider 新增至config/app.php 中的providers 陣列中
Barryvdh\Snappy\ServiceProvider::class
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5. 將Facades 加入到config/app.php 中的aliases 陣列中
'PDF' => Barryvdh\Snappy\Facades\SnappyPdf::class,
'SnappyImage' => Barryvdh\Snappy\Facades\SnappyImage::class,
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6. 執行產生設定檔
php artisan vendor:publish --provider="Barryvdh\Snappy\ServiceProvider"
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可以看到預設的設定檔為config/snappy.php：
return [
'pdf' => [
'enabled' => true,
'binary' => env('WKHTML_PDF_BINARY', '/usr/local/bin/wkhtmltopdf'),
'timeout' => false,
'options' => [],
'env' => [],
],
'image' => [
'enabled' => true,
'binary' => env('WKHTML_IMG_BINARY', '/usr/local/bin/wkhtmltoimage'),
'timeout' => false,
'options' => [],
'env' => [],
],
];登入後複製
注意，這裡有個坑，預設binary 配置為/usr/local/bin/wkhtmltopdf 和/usr/local/bin/wkhtmltoimage，在第一個次使用的時候，會報錯/usr/local/bin/wkhtmltopdf不存在，這是因為在linux 系統下，wkhtmltopdf 和wkhtmltoimage 的真實路徑和名稱為：/usr/local/bin/wkhtmltopdf-amd64 和/usr/ local/bin/wkhtmltoimage-amd64。
因此，需要把設定資訊修改為：
'pdf' => [
...
'binary' => env('WKHTML_PDF_BINARY', '/usr/local/bin/wkhtmltopdf-amd64'),
...
],
'image' => [
...
'binary' => env('WKHTML_IMG_BINARY', '/usr/local/bin/wkhtmltoimage-amd64'),
...
],登入後複製
開始使用
//使用方法1
$pdf = \PDF::loadView('welcome', $data);
return $pdf->download('welcome.pdf');
//使用方法2
$html = '<html><head><meta charset="utf-8"></head><h1>订单id</h1><h2>12346546</h2></html>';
$pdf = \PDF::loadHTML($html);
return $pdf->inline();
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很多部落格裡沒有提到，使用方法1中，會報這樣的錯誤：
The exit status code '1' says something went wrong: stderr: "Loading pages (1/6) [> ] 0% [======> ] 10% QSslSocket: cannot resolve CRYPTO_num_locks QSslSocket: cannot resolve CRYPTO_set_id_callback QSslSocket: cannot resolve CRYPTO_set_locking_callback QSslSocket: cannot resolve sk_free QSslSocket: cannot resolve sk_num QSslSocket: cannot resolve sk_pop_free QSslSocket: cannot resolve sk_value QSslSocket: cannot resolve SSL_library_init QSslSocket: cannot resolve SSL_load_error_strings QSslSocket: cannot resolve SSLv3_client_method QSslSocket: cannot resolve SSLv23_client_method QSslSocket: cannot resolve SSLv3_server_method QSslSocket: cannot resolve SSLv23_server_method QSslSocket: cannot resolve X509_STORE_CTX_get_chain QSslSocket: cannot resolve OPENSSL_add_all_algorithms_noconf QSslSocket: cannot resolve OPENSSL_add_all_algorithms_conf QSslSocket: cannot resolve SSLeay QSslSocket: cannot call unresolved function CRYPTO_num_locks QSslSocket: cannot call unresolved function CRYPTO_set_id_callback QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function sk_num [==================> ] 31% QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_library_init [============================================================] 100% Counting pages (2/6) [============================================================] Object 1 of 1 Resolving links (4/6) [============================================================] Object 1 of 1 Loading headers and footers (5/6) Printing pages (6/6) [> ] Preparing [============================================================] Page 1 of 1 Done Exit with code 1 due to network error: UnknownNetworkError QSslSocket: cannot call unresolved function CRYPTO_num_locks QSslSocket: cannot call unresolved function CRYPTO_set_id_callback QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback " stdout: "" command: /usr/local/bin/wkhtmltopdf-amd64 --lowquality '/tmp/knp_snappy612c3edcdfc855.21787864.html' '/tmp/knp_snappy612c3edcdfce49.80482557.pdf'.
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執行：
sudo apt-get update
sudo apt install libssl1.0-dev
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修復完成，匯出welcome 頁面。
如果使用 save () 方法儲存，預設儲存到 /public 資料夾下，如果檔案名稱相同的情況下，第二次儲存會提示檔案已經存在。
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