How to remove 0 values ​​from php array

Two removal methods: 1. Use the array_diff() function to compare an array containing only "0" with the original array. The syntax is "array_diff($arr, [0])"; 2. Use the array_filter() function to call the callback function to filter the array, the syntax is "function f($var){return($var!==0);}$arr=array_filter($arr,"f");".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Method 1: Use The array_diff() function removes 0

array_diff() function is used to compare the values ​​of two (or more) arrays and return the difference.

array_diff(array1,array2,array3...);

Just use an array containing only "0" to compare with the original array, syntax: array_diff($arr, [0])

Example ：

<?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);
?>

Note: The array_diff() function compares the values ​​​​of two (or more) arrays (value in key=>value), and Returns a difference array containing all values ​​that are in the compared array (array1) but not in any of the other argument arrays (array2 or array3, etc.).

Method 2: Use the array_filter() function to remove 0 in the array

The array_filter() function uses a callback function to filter the elements in the array.

This function passes each key value in the input array to the callback function. If the callback function returns true, the current key value in the input array is returned to the result array. Array key names remain unchanged.

array_filter ( array $array [, callable $callback [, int $flag = 0 ]] )

Parameters	Description
array	Required . Specifies the array to filter.
callback	Optional. Specifies the callback function to be used.
flag	Optional. Determine the parameter form received by the callback: ARRAY_FILTER_USE_KEY - callback accepts the key name as the only parameter ARRAY_FILTER_USE_BOTH - callback accepts both key name and key value

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
function f($var)
{
    return($var!==0);
}

$arr=array(1,2,3,0,1,"a","","c",0);
echo "原数组：";
var_dump($arr);
$arr = array_filter($arr,"f");
echo "去除0后：";
var_dump($arr);
?>

Note: If the array_filter() function does not have a callback function, the default is to delete the value in the array as false s project.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
  $arr=array(1,2,3,0,1,"0","","c",0,null,FALSE);
echo "原数组：";
var_dump($arr);
$arr = array_filter($arr);
var_dump($arr);
?>

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