PHP is_readable() Function
 Complete PHP Filesystem Reference
 Complete PHP Filesystem Reference
Definition and Usage
The is_readable() function checks whether the specified file is readable.
This function returns TRUE if the file is readable.
Syntax
is_readable(file)
| Parameter | Description | 
|---|---|
| file | Required. Specifies the file to check | 
Tips and Notes
Note: The result of this function are cached. Use clearstatcache() to clear the cache.
Example
<?php
$file = "test.txt";
if(is_readable($file))
  {
  echo ("$file is readable");
  }
else
  {
  echo ("$file is not readable");
  }
?>
The output of the code above could be:
test.txt is readable
 Complete PHP Filesystem Reference
 Complete PHP Filesystem Reference

