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is_long

Name

is_long — Tests whether a value is an integer.

Synopsis

bool is_long(value); mixed value: Value or variable to test

Returns

TRUE if the value is an integer; FALSE otherwise

Description

is_long() checks whether value is an integer. If so, the function returnsTRUE. If not, FALSE is returned.

Version

PHP Version: 3+, 4+

Example

Example 1392. Test whether a value is an integer

$value = 29.5 + 0.5;

// Note that even though $value contains 30 it is still not an integer.
// This is because the value of 30 was created by adding two doubles
// ...making the resulting value a double as well
if (is_long ($value))
    print 'Value $value is an integer.';
else
    print 'Value $value is not an integer.';

$value = 30;

// Now $value contains an integer
if (is_long ($value))
    print 'Value $value is an integer.';
else
    print 'Value $value is not an integer.';

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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.