PHP 函数fwrite()

fwrite()函数可以向打开的文件写入内容。该函数可以在文件末尾或者达到指定长度时停止写入，以先到者为准。此函数可以返回写入的字节数，或在失败时返回false。

语法

int fwrite ( resource handle , stringstring [, int $length ] )

此函数可以将字符串的内容写入指向句柄的文件流中。

示例1

<?php
   file = fopen("/PhpProject/sample.txt", "w");
   echo fwrite(file, "Hello Tutorialspoint!!!!!");
   fclose($file);
?>

输出

25

示例2

<?php
   filename = "/PhpProject/sample.txt";somecontent = "Add this to the file\n";

   if(is_writable(filename)) {
      if(!handle = fopen(filename, 'a')) {
         echo "Cannot open file (filename)";
         exit;
       }
   if(fwrite(handle,somecontent) === FALSE) {
      echo "Cannot write to file (filename)";
      exit;
   }
   echo "Success, wrote (somecontent) to file (filename)";
   fclose(handle);

   } else {
      echo "The file $filename is not writable";
   }
?>

输出

Success, wrote (Add this to the file) to file (/PhpProject/sample.txt)