What does count mean in php?

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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