PHP sizeof() Function

Complete PHP Array Reference

Definition and Usage

The sizeof() function counts the elements of an array, or the properties of an object.

This function is an alias of the count() function.



Parameter Description
array Required. Specifies the array or object to count.
mode Optional. Specifies the mode of the function. Possible values:
  • 0 - Default. Does not detect multidimensional arrays (arrays within arrays)
  • 1 - Detects multidimensional arrays

Note: This parameter was added in PHP 4.2

Tips and Notes

Note: This function may return 0 if a variable isn't set, but it may also return 0 if a variable contains an empty array. The isset() function can be used to test if a variable is set.


$people = array("William", "Yousuf", "Glenn", "Romain");
$result = sizeof($people);

echo $result;

The output of the code above will be:


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