PHP is_nan() Function

PHP is _nan() function is used to check whether a value is not a number. It is important mathematical function.

It returns true if the value is not a number. Otherwise it returns false/nothing.

Syntax:

Parameter	Description	Required/Optional
Value	Value to check	Required

Example 1

<?php 
$nos =200;
echo "Your value is :".$nos;
echo "<br>"."By using 'is_nan()' Function your value is:".is_nan($nos);
?>

Output:

Your value is :200
By using 'is_nan()' Function your value is:

Example 2

<?php 
$nos =acos(1.01);
echo "Your value is :acos(1.01)";
echo "<br>"."By using 'is_nan()' Function your value is:".is_nan($nos);
?>

Output:

Your value is :acos(1.01)
By using 'is_nan()' Function your value is:1

Example 3

<?php 
$finite =40;
var_dump(is_nan($finite));
?>

Output:

bool(false)

Example 4

<?php 
$infinite = log(0);
var_dump(is_nan($infinite));
?>

Output:

bool(false)

Example 5

<?php 
$nan = acos(2);
var_dump(is_nan($nan));
?>

Output:

bool(true)

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PHP is_nan() Function

Syntax:

Example 1

Example 2

Example 3

Example 4

Example 5

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