How to remove empty spaces in array in php

In PHP, when processing arrays, you often encounter situations where you need to remove empty elements in the array. This article will introduce several methods to remove empty elements from arrays in PHP.

1. Use the array_filter function

The array_filter function can be used to filter elements in the array. If the callback function is not set, elements with a value of false will be deleted. When using this function, please note that this method will delete the following values ​​by default:

1. Elements whose values ​​are "", 0, null, false, array()
2. The key is "", 0, null, false elements

In other words, if we need to delete all empty elements in the array, we can do it in the following way:

$arr = array('a', 'b', null, false, '', 'c');
$arr = array_filter($arr);
print_r($arr); //输出为array('a','b','c')

2. Use foreach loop

Use a foreach loop to traverse the array and decide whether to remove it from the array by judging whether the value of each element is empty. The sample code is as follows:

$arr = array('a', 'b', null, false, '', 'c');
foreach($arr as $key => $value){
    if(empty($value)){
        unset($arr[$key]);
    }
}
print_r($arr); //输出为array('a','b','c')

3. Use the array_diff function

The array_diff function can be used to calculate the difference set of arrays, that is, return an array that contains everything in the first array but not in any other array. an array of values. Therefore, we can perform a difference operation between the original array and the array containing only empty elements to obtain a new array with the empty elements deleted. Examples are as follows:

$arr = array('a', 'b', null, false, '', 'c');
$empty_arr = array('', null, false);
$new_arr = array_diff($arr, $empty_arr);
print_r($new_arr); //输出为array('a','b','c')

Summary

The above three methods can be used to remove empty elements in the array, and you need to choose according to the actual situation. In addition, it should be noted that when performing array operations, try to use appropriate functions and avoid using unverified methods.

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