PHP同時文件訪問/ flock（）問題

-1

我在執行一個應該從文件中解析json字符串的腳本時遇到問題，要麼用相同的id覆蓋對象，要麼將其添加到json數組中，並將其寫回文件。該腳本在for循環中調用，以便我試圖使用flock來防止在解析json字符串之前覆蓋文件，但結果看起來非常奇怪，我不知道出了什麼問題。下面是該腳本：PHP同時文件訪問/ flock（）問題

$method = $_SERVER['REQUEST_METHOD']; 

$file = fopen($userid . '.json', 'c+'); 
flock($file, LOCK_EX); 

$jsonStr = (filesize($userid . '.json') == 0) ? '{"success": true}' : fread($file, filesize($userid . '.json')); 
$jsonObj = json_decode($jsonStr); 

if($method === 'POST') { 
$dataStr = file_get_contents('php://input'); 
$dataObj = json_decode($dataStr); 

$replacements = array(); 
if(isset($jsonObj->images)) { 
    foreach($jsonObj->images as $idx=>$image) { 
      if($image->id == $dataObj->id) { 
       $replacements += array($idx => $dataObj); 
      } 
    } 
    if(count($replacements)==0) { 
     array_push($replacements, $dataObj); 
    } 
    $jsonObj->images = array_replace($jsonObj->images, $replacements); 
} else { 
    //$jsonObj = new stdClass(); 
    $jsonObj->images = new stdClass(); 
    $jsonObj->images = array($dataObj); 
} 


fwrite($file, json_encode($jsonObj)); 
file_put_contents('log.json', json_encode($dataObj), FILE_APPEND); 

echo '{"success":true, "images":' . $dataStr . '}'; 
} else if($method === 'GET') { 
echo $jsonStr; 
} 

fclose($file);

至於結果我得到某個三個文件只是一個所謂的「以.json」，另一種正確用戶ID以.json和log.json。該日誌看起來最好，因爲所有26個對象都正確顯示，但沒有先檢查退出對象。在「以.json」僅僅是空白的，看起來非常奇怪：

{"success":true,"images":[{"id":"f9f4b6ee-8b7b-414e-98f4-47ed5ee3c594","top":1200,"left":4050,"clicks":0,"affinity":[]}]} 
{"success":true,"images":[{"id":"034c7661-9466-4651-b860-7e049e1543ac","top":900,"left":600,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"eebc35ec-6c0e-416a-9516-061df821083d","top":1800,"left":3300,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"e09da5b9-2e65-4a12-94cd-4745b354a256","top":1200,"left":1200,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"b023a259-4554-48a5-acd8-cb4215e6a391","top":1350,"left":1500,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"6521d8c3-461c-4fcd-b69d-69f14ae37418","top":600,"left":3750,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"4c082c1a-d4ae-4c1c-bfc4-ed36980f5db2","top":3150,"left":600,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"22dbdea2-4936-4353-825e-9af6e6f2ca93","top":3000,"left":2100,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"a7ba32d4-912e-489d-8f9b-e412bc1629c1","top":2850,"left":3750,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"b258148d-1779-4f17-ae5e-1160aa0a34b9","top":750,"left":4050,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"21c1c9d1-a7a6-48d2-a4ba-174c0fe248a3","top":1650,"left":750,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"bfed2f56-7876-4eb2-a217-e0f71f4455ee","top":3300,"left":1500,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"7f13b674-5d07-444f-bf6d-463758c96788","top":1650,"left":1950,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"fb8711f2-ba10-44d7-9038-02cae6438506","top":1800,"left":450,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"ac83e869-e4fb-4eee-8d2e-4d26762101d9","top":750,"left":1800,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"069a7595-2271-4430-b324-974115df7b80","top":2550,"left":1800,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"ea9ab2fc-e179-4f56-9ce7-8af456911b33","top":1950,"left":750,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"9b997ae3-0c66-4f78-937a-2fde2470d7d7","top":300,"left":300,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"f860dea4-3b27-4401-999b-72ce45022110","top":1200,"left":1950,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"2633c107-8a51-4e9c-bc2c-f87c30f7359d","top":750,"left":2100,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"bebcb2bb-c2f0-4e4d-b202-b05090eacf49","top":3600,"left":3600,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"460f961e-f1dd-4329-95be-d30770a37b83","top":2400,"left":1200,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"ee9b254f-fe6a-4ece-a662-e934625e992a","top":3600,"left":600,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"4e047ea9-345e-4cf9-a066-d0b431820c61","top":2100,"left":1350,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"8bbb5327-6d39-40e1-919e-d7b70e13fc2b","top":2700,"left":1200,"clicks":0,"affinity":[]}]} 
{"images":[{"id":"0c50c0ec-e18b-4917-9787-bad245eed798","top":1200,"left":2550,"clicks":0,"affinity":[]}]}

我也得到一個異常：

<b>Strict Standards</b>: Creating default object from empty value in <b>C:\xampp\htdocs\gallery\store.php</b> on line <b>38</b><br />

我想我沒有正確認識的過程，我很高興任何幫助。

編輯：我想要的結果，看起來是這樣的：

{"success":true,"images":[{"id":"f9f4b6ee-8b7b-414e-98f4-47ed5ee3c594","top":1200,"left":4050,"clicks":0,"affinity":[]}, 
{"id":"034c7661-9466-4651-b860-7e049e1543ac","top":900,"left":600,"clicks":0,"affinity":[]},{"id":"eebc35ec-6c0e-416a-9516-061df821083d","top":1800,"left":3300,"clicks":0,"affinity":[]}, 
{"id":"e09da5b9-2e65-4a12-94cd-4745b354a256","top":1200,"left":1200,"clicks":0,"affinity":[]}, 
{"id":"b023a259-4554-48a5-acd8-cb4215e6a391","top":1350,"left":1500,"clicks":0,"affinity":[]}, 
{"id":"6521d8c3-461c-4fcd-b69d-69f14ae37418","top":600,"left":3750,"clicks":0,"affinity":[]}, 
{"id":"4c082c1a-d4ae-4c1c-bfc4-ed36980f5db2","top":3150,"left":600,"clicks":0,"affinity":[]}, 
{"id":"22dbdea2-4936-4353-825e-9af6e6f2ca93","top":3000,"left":2100,"clicks":0,"affinity":[]}, 
{"id":"a7ba32d4-912e-489d-8f9b-e412bc1629c1","top":2850,"left":3750,"clicks":0,"affinity":[]}, 
{"id":"b258148d-1779-4f17-ae5e-1160aa0a34b9","top":750,"left":4050,"clicks":0,"affinity":[]}, 
{"id":"21c1c9d1-a7a6-48d2-a4ba-174c0fe248a3","top":1650,"left":750,"clicks":0,"affinity":[]}, 
{"id":"bfed2f56-7876-4eb2-a217-e0f71f4455ee","top":3300,"left":1500,"clicks":0,"affinity":[]}, 
{"id":"7f13b674-5d07-444f-bf6d-463758c96788","top":1650,"left":1950,"clicks":0,"affinity":[]}, 
{"id":"fb8711f2-ba10-44d7-9038-02cae6438506","top":1800,"left":450,"clicks":0,"affinity":[]}, 
{"id":"ac83e869-e4fb-4eee-8d2e-4d26762101d9","top":750,"left":1800,"clicks":0,"affinity":[]}, 
{"id":"069a7595-2271-4430-b324-974115df7b80","top":2550,"left":1800,"clicks":0,"affinity":[]}, 
{"id":"ea9ab2fc-e179-4f56-9ce7-8af456911b33","top":1950,"left":750,"clicks":0,"affinity":[]}, 
{"id":"9b997ae3-0c66-4f78-937a-2fde2470d7d7","top":300,"left":300,"clicks":0,"affinity":[]}, 
{"id":"f860dea4-3b27-4401-999b-72ce45022110","top":1200,"left":1950,"clicks":0,"affinity":[]}, 
{"id":"2633c107-8a51-4e9c-bc2c-f87c30f7359d","top":750,"left":2100,"clicks":0,"affinity":[]}, 
{"id":"bebcb2bb-c2f0-4e4d-b202-b05090eacf49","top":3600,"left":3600,"clicks":0,"affinity":[]}, 
{"id":"460f961e-f1dd-4329-95be-d30770a37b83","top":2400,"left":1200,"clicks":0,"affinity":[]}, 
{"id":"ee9b254f-fe6a-4ece-a662-e934625e992a","top":3600,"left":600,"clicks":0,"affinity":[]}, 
{"id":"4e047ea9-345e-4cf9-a066-d0b431820c61","top":2100,"left":1350,"clicks":0,"affinity":[]}, 
{"id":"8bbb5327-6d39-40e1-919e-d7b70e13fc2b","top":2700,"left":1200,"clicks":0,"affinity":[]}, 
{"id":"0c50c0ec-e18b-4917-9787-bad245eed798","top":1200,"left":2550,"clicks":0,"affinity":[]}]}

乾杯，丹尼爾

來源

2012-02-06 Daniel

好像它可能會更容易和更快的使用數據庫呢？如果我們可以看到輸出結果旁邊的輸出結果可能會有所幫助。 – dqhendricks 2012-02-06 23:19:54

我終於有工作和其他任何人具有同步文件訪問的問題，這是我的解決方案：

檢查文件是否存在，如果不存在，創建它並設置數據結構（防止嚴格的標準錯誤）

$filename = $userid . '.json'; 
if(!file_exists($filename)) { 
    $file = fopen($filename, 'w'); 
    if(flock($file, LOCK_EX)) { 
     fwrite($file, '{"success": true, "images": []}'); 
     flock($file, LOCK_UN); 
     fclose($file); 
    } 
}

使用c +作爲第二個參數（w +將文件大小設置爲0）打開文件。檢查你是否可以獲得排他鎖。閱讀文件並倒帶，以便稍後覆蓋它。

else { 
    $file = fopen($userid . '.json', 'c+'); 
    if(flock($file, LOCK_EX)) { 
     $jsonStr = fread($file, filesize($userid . '.json')); 
     $jsonObj = json_decode($jsonStr); 
     rewind($file);

使用FWRITE

 if($method === 'POST') { 
      $dataStr = file_get_contents('php://input'); 
      if(isset($dataStr) &&$dataStr != '') { 
       $dataObj = json_decode($dataStr); 
       $replace = -1; 
       foreach($jsonObj->images as $idx=>$image) { 
        if($image->id == $dataObj->id) { 
         $replace = $idx; 
        } 
       } 
       if($replace != -1) { 
        $img = $jsonObj->images; 
        $img[$replace] = $dataObj; 
        $jsonObj->images = $img; 
       } else { 
        array_push($jsonObj->images, $dataObj); 
       } 
       fwrite($file, json_encode($jsonObj)); 
      } 
      echo '{"success":true, "images":' . $dataStr . '}'; 
     } else if($method === 'GET') { 
      echo $jsonStr; 
     }

解除鎖定操縱你怎麼需要它的對象，並將其寫回的編碼JSON字符串並關閉文件。
```
 flock($file, LOCK_UN); 
     fclose($file); 
    } 
} 
```

來源

2012-02-07 12:35:53 Daniel

PHP同時文件訪問/ flock（）問題

回答

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