How to get how many elements there are in an array in php

php method to get how many elements there are in an array: 1. Use the count() function to count the number of all elements in the array, the syntax is "count(array,mode)"; 2. Use sizeof( ) function, which can calculate the number of elements in an array, the syntax is "sizeof(array,mode)".

The operating environment of this tutorial: windows7 system, PHP version 7.1, DELL G3 computer

I want to count the number of array elements in PHP In fact, it is very simple. PHP provides us with two functions, namely count() and sizeof() functions.

In fact, the sizeof() function is an alias of the count() function, that is, the function and usage of the sizeof() function are exactly the same as the count() function.

Let’s introduce the count() function to you to understand these two functions.

The count() function can count the number of all elements in the array, or the number of attributes in the object. Its syntax format is as follows:

count(array,mode)

The parameter description is as follows:

• array: is the array or object to be counted;
• mode: is an optional parameter and can be omitted.
  • If the mode parameter is omitted or set to COUNT_NORMAL or 0, the count() function will not detect multi-dimensional arrays;
  • If the mode is set to COUNT_RECURSIVE or 1, the count() function will be recursive Calculate the number of elements in an array, especially useful for calculating the number of elements in multi-dimensional arrays.

Example 1: Count the number of elements in a one-dimensional array

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
//输出语句
var_dump($arr);
echo "数组长度为：".count($arr);
?>

Example 2: Count the number of elements in a two-dimensional array

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array(
"张三",
25,
array("高数","PHP教程","英语")
);
//输出语句
var_dump($arr);
echo "数组长度为：".sizeof($arr,1);
?>

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