How to get the number of different elements in an array in php

Obtaining method: 1. Use the array_unique() function to remove duplicate elements in the array, so that there is only one element of each type in the array. The syntax is "array_unique($arr)"; 2. Use sizeof() to obtain deduplication. The number of elements in the array, the syntax is "sizeof (deduplication array)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php gets different arrays Number of elements

Implementation idea:

• If you want to get the number of different elements in the array, you first need to remove duplicate elements in the array --Use array_unique()

• # and then get the number of elements of the deduplicated array, that is, the length of the array --Use sizeof()

Implementation code:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,2,3,3,"a","f",2,1,"g","a");
var_dump($arr);
$newArr=array_unique($arr);
var_dump($newArr);
echo "数组不同元素的个数为：".sizeof($newArr);
?>

Description:

array_unique() function removes duplicates in the array value and returns the result array. When the values ​​of several array elements are equal, only the first element is retained and the other elements are deleted. The key names in the returned array remain unchanged.

The sizeof() function can count the number of all elements in the array, or the number of attributes in the object.

Recommended learning: "PHP Video Tutorial", "PHP ARRAY"

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