Function to find the length of an array in php

In PHP, there are many ways to calculate the length of an array. Here are three commonly used methods:

1. count() Function

count() The function can return an array The number of elements, the syntax is as follows:

count($array)

Among them, the $array parameter is the array whose length is to be calculated.

Sample code:

$array = [1, 2, 3, 4];
echo count($array); // 输出 4

2. sizeof() Function

##sizeof() Function andcount() The function does the same thing and is used to count the number of elements in an array. The syntax is as follows:

sizeof($array)

Among them, the

$array parameter is the array whose length is to be calculated.

Sample code:

$array = [1, 2, 3, 4];
echo sizeof($array); // 输出 4

3. array_length Function (PHP 7.3)

##array_length is new in PHP 7.3

Function, used to get the length of the array. The syntax is as follows: <pre class="brush:php;toolbar:false">array_length($array[, $recursive = false])</pre> Among them, the

$array

parameter is the array whose length is to be calculated, and the $recursive parameter is optional, if set to true, the length of the multi-dimensional array will be calculated recursively. Sample code:

$array = [1, 2, 3, 4];
echo array_length($array); // 输出 4

It should be noted that the

array_length

function can only be used in PHP 7.3 or higher. Summary:

The above three methods can be used to calculate the length of an array, among which the

array_length

function is a new function in PHP 7.3, compared to count() and sizeof() are more flexible. When using it specifically, you need to choose the appropriate method according to the actual situation.

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