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PHP | stats_stat_innerproduct() Function

PHP stats_stat_innerproduct() 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_stat_innerproduct() Function.

The PHP stats_stat_innerproduct() function returns an inner product of two vectors.


Following below is the syntax to use this function -

float stats_stat_innerproduct( array $arr1, array $arr2 )

Parameter Details



The first array



The second array

Return Value

This PHP function returns an inner product of arr1 and arr2, 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 following example below computes an inner product of arr1 and arr2 -

   var_dump(stats_stat_innerproduct(array(1, 2), array(3, 4)));


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



The following is an error case. In the below example, we have passed unequal length of arrays. A warning is shown in logs -

   // error cases
   var_dump(stats_stat_innerproduct(array(1, 2), array(3, 4, 5)));


The above code will produce the following result and a warning in logs PHP Warning: stats_stat_innerproduct(): Unequal number of X and Y coordinates.


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 stats_stat_paired_t() Function.

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