PHP | sizeof() Function

PHP sizeof() 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 sizeof() Function.

The built-in PHP sizeof() function counts elements in an array, or the properties in an object.

If the optional mode parameter is set to COUNT_RECURSIVE (or 1), then sizeof() function will recursively count the array. This is particularly useful for counting all the elements of a multidimensional array. The stock value for mode is 0. The sizeof() function does not detect infinite recursion.


Following below is the syntax to use this function -

sizeof($array, $mode );

Parameter Details

Sr.NoParameter & Description


Required. Specifies an array



Optional. Specifies the mode of the function.

Return Value

This built-in function returns the number of elements in an array.


Try out the below example -

   $a[0] = 1;
   $a[1] = 3;
   $a[2] = 5;
   $result = sizeof($a);


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 are going to be discussing about the PHP sort() Function.

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