How to remove null values ​​from array in php

In PHP, you can use the system function "array_filter" to remove null values. The syntax is "array_filter (parameter 1, parameter 2);". This function sequentially removes each value in the "parameter 1" array. Passed to the "parameter 2" function.

There are many ways to remove empty elements from an array in PHP, but there is a system function that is the most convenient:

array_filter (参数1，参数2);

This function is Pass each value in the "parameter1" array to the "parameter2" function in turn. If the "Parameter2" function returns TRUE, the current value of the "Parameter1" array will be included in the returned result array. The key names of the array remain unchanged.

If you only need to remove empty elements in the array, parameter 2 can be omitted and included in the array:

$arr1=array( "a" => 1 , "b" => 0 , "c" => 3 , "d" => "" , "e" => 5 ,"f"=>array());
//执行
$arr1=array_filter ($arr1);
//结果为
array( "a" => 1 , "c" => 3 , "e" => 5 );

For more related knowledge, please visit PHP Chinese website!

The above is the detailed content of How to remove null values ​​from array in php. For more information, please follow other related articles on the PHP Chinese website!