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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.


Following below is the syntax to use this function -

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

Parameter Details



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



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.


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).


The below example computes the variance of values in a -

   var_dump(stats_variance($a, true));


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


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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