How to remove 0 and duplicate values ​​from php array

Steps to remove 0 and duplicate values ​​from php array: 1. Use the array_diff() function to remove 0 from the array. The syntax "array_diff($arr, [0])" will return an array of 0's; 2 . Use the array_unique() function to delete duplicate values ​​in the 0 array. The syntax is "array_unique($arr)".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php array removal 0 and duplicate values

Step 1: Use the array_diff() function to remove 0 in the array

array_diff() function is used to compare two array values ​​and return the difference set, you only need to use an array containing "0" to compare with the original array

Syntax:array_diff($arr, [0])

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1,2,3,0,1,"a","b","c",0,"d","a","c");
echo "原数组：";
var_dump($arr);
$arr = array_diff($arr, [0]);
echo "去除0后：";
var_dump($arr);
?>

Step 2: Use array_unique() to delete duplicate values ​​in the 0 array

array_unique() function removes the duplicate values ​​​​in the array Duplicate values ​​and return the resulting array.

When the values ​​of several array elements are equal, only the first element is retained and the other elements are deleted.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1,2,3,0,1,"a","b","c",0,"d","a","c");
$arr = array_diff($arr, [0]);
echo "去除0后：";
var_dump($arr);
echo "去除重复值后：";
var_dump(array_unique($arr));
?>

Description:

array_diff() The function is used to compare two (or more ) value of the array and returns the difference set.

This function compares the values ​​​​of two (or more) arrays (key=>value in value), and returns a difference array, which includes all the arrays being compared (array1 ), but not in any other parameter array (array2 or array3, etc.).

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