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PHP | stats_variance() Function

PHP stats_variance() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP stats_variance() Function.

The PHP stats_variance() function returns the variance.

Syntax

Following below is the syntax to use this function -

float stats_variance( array $a [, bool $sample = false ] )


Parameter Details

Sr.NoParameterDescription
1

a

The array of data to find the standard deviation for. Note that all values of the array will be cast to float

2

sample

Indicates if a represents a sample of the population; defaults to false.


Return Value

This built-in function returns the variance of values in a, or false on failure.

Dependencies

This built-in function was first introduced in statistics extension (PHP version 4.0.0 and PEAR v1.4.0). In this tutorial guide, we used the latest release of stats-2.0.3 (PHP v7.0.0 or newer and PEAR version 1.4.0 or newer).

Example

The below example computes the variance of values in a -

<?php
   $a=array(5,7,8,10,10);
   var_dump(stats_variance($a));
   var_dump(stats_variance($a, true));
?>

Output

When the above code is executed, it will produce the following result -

float(3.6) 
float(4.5)


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about the PHP String Functions.

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