count is a built-in function in PHP. The count() function returns the number of elements in the array.
Syntax:
count(array,mode);
Parameters:
array: required. Specifies an array.
mode: optional. Specify the mode. Possible values:
● 0 - Default. Do not count all elements in a multidimensional array
● 1 - Recursively count the number of elements in the array (count all elements in a multidimensional array)
Description:
count() function counts the number of cells in an array or the number of attributes in an object.
For an array, return the number of its elements, for other values, return 1; if the parameter is a variable and the variable is not defined, return 0.
If mode is set to COUNT_RECURSIVE (or 1), the number of elements in the array in the multidimensional array will be calculated recursively.
Example:
<?php header("content-type:text/html;charset=utf-8"); $cars = array("Volvo" => array("XC60", "XC90"), "BMW" => array("X3", "X5"), "Toyota" => array("Highlander") ); echo "常规计数:" . count($cars) . "<br>"; echo "递归计数:" . count($cars, 1); ?>
Result:
常规计数:3 递归计数:8
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