Latest web development tutorials

×

PHP Tutorial

PHP HOME PHP Intro PHP Install PHP Syntax PHP Variables PHP Echo / Print PHP Data Types PHP Strings PHP Constants PHP Operators PHP If...Else...Elseif PHP Switch PHP While Loops PHP For Loops PHP Functions PHP Arrays PHP Sorting Arrays PHP Superglobals

PHP Handling

PHP Form Handling PHP Form Validation PHP Form Required PHP Form URL/E-mail PHP Form Complete

PHP Advanced

PHP Arrays Multi PHP Date and Time PHP Include PHP File Handling PHP File Open/Read PHP File Create/Write PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP Filters Advanced PHP Error Handling PHP Exception

MySQL Database

MySQL Database MySQL Connect MySQL Create DB MySQL Create Table MySQL Insert Data MySQL Get Last ID MySQL Insert Multiple MySQL Prepared MySQL Select Data MySQL Delete Data MySQL Update Data MySQL Limit Data

PHP - XML

PHP XML Parsers PHP SimpleXML Parser PHP SimpleXML - Get PHP XML Expat PHP XML DOM

PHP - AJAX

AJAX Intro AJAX PHP AJAX Database AJAX XML AJAX Live Search AJAX RSS Reader AJAX Poll

PHP Examples

PHP Examples PHP Quiz PHP Certificate

PHP Reference

PHP Array PHP Calendar PHP Date PHP Directory PHP Error PHP Filesystem PHP Filter PHP FTP PHP HTTP PHP Libxml PHP Mail PHP Math PHP Misc PHP MySQLi PHP SimpleXML PHP String PHP XML PHP Zip PHP Timezones

PHP is_finite() Function

< PHP Math Reference

Example

Check whether a value is finite or not:

<?php
echo is_finite(2) . "<br>";
echo is_finite(log(0)) . "<br>";
echo is_finite(2000);
?>

Definition and Usage

The is_finite() function checks whether a value is finite or not.

This function returns true (1) if the specified value is a finite number, otherwise it returns false/nothing.

The value is finite if it is within the allowed range for a PHP float on this platform.

Syntax

is_finite(value);

Parameter	Description
value	Required. Specifies the value to check

Technical Details

Return Value:	TRUE if value is a finite number, FALSE otherwise
Return Type:	Boolean
PHP Version:	4.2+

< PHP Math Reference