PHP is_finite() Function

The PHP is_finite() function is used to check if the argument is a finite value or not. It returns true (1) if the argument is finite, else returns false/nothing.

Syntax

is_finite(x)

Parameters

`x`	`Required.` Specify the value.

Return Value

Returns true (1) if the argument is finite, else returns false/nothing.

Example:

In the example below, is_finite() function is used to check if the argument is finite.

<?php
echo var_dump(is_finite(10));
echo var_dump(is_finite(-10));
echo var_dump(is_finite(log(0))); 

echo "\n"; 
echo var_dump(is_finite(INF));
echo var_dump(is_finite(-INF));
echo var_dump(is_finite(NAN));   
?>

The output of the above code will be:

bool(true)
bool(true)
bool(false)

bool(false)
bool(false)
bool(false)

❮ PHP Math Reference