我正在嘗試創(chuàng)建一個本地txt文件，在里面寫一些文本，關閉它，讀取并返回其內容，然后附加更多的文本，最后，再次閱讀它并回顯內容。<?php $file = "test.txt"; $fileHandler = fopen($file, "w") or die("Could not write to file!"); fwrite($fileHandler, "This is my first message <br>"); fwrite($fileHandler, "This is my second message <br>"); fclose($fileHandler); $fileHandler = fopen($file, "r") or die("Could not read file!");; $contents = fread($fileHandler, filesize($file)); fclose($fileHandler); echo $contents; echo "<br>"; echo "FileSize after first write: " . filesize($file); echo "<br>"; echo "<hr>"; $fileHandler = fopen($file, "a") or die("Could not append to file!"); fwrite($fileHandler, "This is my third message <br>"); fclose($fileHandler); $fileHandler = fopen($file, "r") or die("Could not read file!");; $contents = fread($fileHandler, filesize($file)); fclose($fileHandler); echo $contents; echo "<br>"; echo "FileSize after append: " . filesize($file); echo "<br>";一切都按預期工作，所有消息都寫入文件，但問題出在回聲上。我期待看到這樣的東西：This is my test messageThis is my second test messageFileSize after first write: 63-----------------------------------------------------------------This is my test messageThis is my second test messageThis is my third test messageFileSize after append: 97但我得到以下回聲：This is my test messageThis is my second test messageFileSize after first write: 63--------------------------------------------------------------------This is my test messageThis is my second test messageFileSize after append: 63我不知道這里的問題是什么...任何幫助將不勝感激!!!!
3 回答
慕仙森
TA貢獻1827條經(jīng)驗 獲得超8個贊
在文件大?。ǎ?/code> 的文檔頁面中
注意：此函數(shù)的結果將被緩存。有關更多詳細信息，請參閱清除統(tǒng)計緩存（）。
因此，您必須在編寫新內容后清除緩存：
$fileHandler = fopen($file, "a") or die("Could not append to file!");
fwrite($fileHandler, "This is my third message <br>");
fclose($fileHandler);
clearstatcache();
Helenr
TA貢獻1780條經(jīng)驗 獲得超4個贊
首先，用于以讀+寫模式打開文件，這意味著它與您的問題無關。然后，正如在其他 anwers 中已經(jīng)提到的，該函數(shù)被緩存，您需要使用才能看到更改。a+filesize()clearstatcache()
作為 + + 的替代方法，您可以使用組合了 3 個函數(shù)的函數(shù)。fopen()fwrite()fclose()file_put_contents()
例：
$file = __DIR__.'/test.txt';
// First we call the function without second parameter
file_put_contents($file, 'This is my first message'.PHP_EOL);
// Following calls use the second parameter with FILE_APPEND`
file_put_contents($file, 'This is my second message'.PHP_EOL, FILE_APPEND);
echo file_get_contents($file);
echo PHP_EOL.'FileSize after first write: ' . filesize($file) . ' bytes' . PHP_EOL;
clearstatcache();
echo '-----------------------'.PHP_EOL;
file_put_contents($file, 'This is my third message'.PHP_EOL, FILE_APPEND);
echo file_get_contents($file);
echo PHP_EOL.'FileSize after append: ' . filesize($file) . ' bytes' . PHP_EOL;
輸出：
This is my first message
This is my second message
FileSize after first write: 51 bytes
-----------------------
This is my first message
This is my second message
This is my third message
FileSize after append: 76 bytes
`
慕哥9229398
TA貢獻1877條經(jīng)驗 獲得超6個贊
每當您寫入或讀取文件時，PHP 都會緩存更改。所以你必須清除緩存，你可以使用這個函數(shù)來清除PHP緩存的關于文件的信息。clearstatcache()
在這里閱讀更多內容，請 https://www.php.net/manual/en/function.clearstatcache
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