PHP | sizeof() Function

The sizeof() function is a builtin function in PHP and is used to count the number of elements present in an array or any other countable object.

Syntax:

int sizeof(array, mode);

Parameter: This function accepts two parameters as shown in the syntax above and described below:

1. array: This parameter represents the array containing elements which we need to count.
2. mode: This is an optional parameter and specifies the mode of the function. It can take two different values as shown below:
   • 0: It is default, does not count all elements of multidimensional arrays
   • 1: It Counts the array recursively (counts all the elements of multidimensional arrays)

Return Value: This function returns an integer value as shown in the syntax which represents the number of elements present in the array.

Examples:

Input: array(1,2,3,4,5,6)
Output: 6

Input: array(1,2,5,6)
Output: 4

Below programs illustrates the sizeof() funtion in PHP:

• Count number of elements in one dimensional array:

  <?php    // input array    $a=array(1,2,3,4,5,6);       // getting total number of elements     // present in the array.    $result = sizeof($a);       print($result); ?>

  Output:

  6

• Counting number of elements in multi-dimensional array:

  <?php $array = array('name' => array('Geeks', 'For', 'Geeks'),               'article' => array('sizeof', 'function', 'PHP'));    // recursive count echo sizeof($array, 1); // output 8    // normal count echo sizeof($array); // output 2    ?>

  Output:

  8
  2
  

Reference:
http://php.net/manual/en/function.sizeof.php