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php文件讀寫

[英]php file read and write

因此,即時通訊學習php並嘗試使php成為網頁的計數器。 現在,我已經根據自己的理解編寫了此代碼。 問題是,當我在終端中運行程序時,我得到了正確的答案(輸出與我預期的一樣)。 當我在html頁面上執行回顯時,它不起作用。 這是代碼

<html>
<body>
<?php
    #open the file (assuming this file already exists with only 0 in it)
    $file = 'test.txt';
    $file = fopen($file,"r");
    $temp = fread($file, 1024);
    fclose($file);

    #save the number 0 (initial counter to $temp) and delete it)
    $file = 'test.txt';
    unlink($file);

    #open the file (this line just creates the file to write)
    $file = fopen("test.txt","w");
    fclose($file);

    #increase the counter by a number (10 for testing)
    $temp = (int)$temp + 10;
    $file=fopen("test.txt","w");
    fwrite($file,"$temp \n")
    fclose($file);
    #the file only contains a number ($temp - the final counter)

    echo "<h1>$temp<h1>";  #this outputs the correct counter in terminal but only        outputs 10 on html page. ????? 

?>
</body>
</html>

我認為這是許可問題。 例如,嘗試更改chmod / chown:

sudo chown coders:www-data test.txt
sudo chown 765 test.txt

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