What is the usage of count function in php

The usage of the count function in php is: [count(array,mode);], where the parameter array specifies the array to be counted, and the parameter mode specifies the mode of the function.

The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.

The count() function in PHP is used to return the number of elements in an array. Its syntax is as follows:

count(array,mode);

Let’s take a look at its parameters:

array is a required parameter, specifying the array to be counted; mode is an optional parameter, specifying the mode of the function, possible values: 0 - default, do not count all elements in the multidimensional array; 1 - recursively count the number of elements in the array ( Count all elements in a multidimensional array).

Let’s learn how to use the count() function through an example:

Recursively calculate the number of elements in the array:

<?php
$cars=array
(
"Volvo"=>array
(
"XC60",
"XC90"
),
"BMW"=>array
(
"X3",
"X5"
),
"Toyota"=>array
(
"Highlander"
)
);

echo "Normal count: " . count($cars)."<br>";
echo "Recursive count: " . count($cars,1);
?>

The operation results are as follows:

Normal count: 3
Recursive count: 8

Recommended learning: php training

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