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is_readable
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is_readable

Name

is_readable — Checks whether a file is readable.

Synopsis

bool is_readable(filename); string filename:

Returns

TRUE if readable; FALSE otherwise

Description

Checks whether the specified file is readable by PHP. Note that depending on how the script is executed (command line, CGI, module), the test may be performed with varying user IDs, so permissions may affect the result of the function. Safe mode restrictions are not taken into account. Note: The results of this function are cached. See clearstatcache() for details.

Example

Example 335. Check whether a file is readable

$file = "testfile";

if(is_readable($file))
{
    // open and read from file
}
else
{
    echo ("Cannot read from file $file.");
}

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.