is_readable - Determine whether the file exists and is readable

Name:is_readable

Category:File system

Programming Language:php

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

Definition and usage

is_readable() function determines whether the specified file name is readable.

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

输出：

test.txt is readable

 is_readable ( file )

parameter	describe
file	Required. Specify documents to be inspected.

Returns TRUE if the file or directory specified by the file exists and is readable.

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