is_writable - Determine whether the given file name is writable

Name:is_writable

Category:File system

Programming Language:php

One-line Description:Determine whether the file is writable.

Definition and usage

is_writable() function determines whether the specified file is writable.

<?php
$file = "test.txt";
if(is_writable($file))
  {
  echo ("$file is writeable");
  }
else
  {
  echo ("$file is not writeable");
  }
?>

输出：

test.txt is writeable

 is_writable ( file )

parameter	describe
file	Required. Specify documents to be inspected.

Return true if the file exists and is writable. The file parameter can be a directory name that allows for writable checks.

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