(PHP 4, PHP 5, PHP 7 < 7.4.0)
recode_file — Recode from file to file according to recode request
   Recode the file referenced by file handle
   input into the file referenced by file
   handle output according to the recode
   request.
  
示例 #1 Basic recode_file() example
<?php
$input = fopen('input.txt', 'r');
$output = fopen('output.txt', 'w');
recode_file("us..flat", $input, $output);
?>This function does not currently process file handles referencing remote files (URLs). Both file handles must refer to local files.
