How to remove empty values ​​from array in php

In PHP development, we often need to operate on arrays. Sometimes, there may be some empty values ​​in the array. These null values ​​may affect the results of our operations on the array. Therefore, when we develop PHP applications, we need to learn to remove null values ​​​​in arrays. In this article, we will explain how to remove null values ​​from an array in PHP.

1. What is a null value?

In PHP, null values ​​usually refer to the following situations:

1. NULL: Indicates that the variable has no value.
2. Empty string: Indicates that the value of the variable is an empty string ("").
3. Space string: Indicates that the value of the variable is one or more space characters (" ").
4. 0: Indicates that the value of the variable is a numerical value of 0.
5. false: Indicates that the value of the variable is a Boolean value false.
6. Empty array: means there are no elements in the array.

In PHP, null values ​​are often used in conditional statements, loop statements and other statements. If we do not handle null values ​​in the array, it may cause exceptions or incorrect results in the program.

2. Remove null values ​​from the array

1. Use the array_filter() function

In PHP, we can use the array_filter() function to remove the array null value in . The function of this function is to filter the elements in the array and return the elements that meet the conditions.

$array = array(NULL, "", " ", 0, false, array());

$newArray = array_filter($array);

var_dump ($newArray);

In the code, $array is an array containing null values. We use the array_filter() function to operate on it and save the return result in the $newArray variable. You can see through the var_dump() function that null values ​​have been removed from the $newArray array.

2. Use foreach loop traversal

In addition to using the array_filter() function, we can also loop through by writing code, and then save the elements that meet the conditions to a new The method in the array is used to remove the null values ​​​​in the array.

$array = array(NULL, "", " ", 0, false, array());

$newArray = array();

foreach ($ array as $value) {

if ($value !== NULL && $value !== "" && $value !== " " && $value !== 0 && $value !== false && $value !== array()) {
    $newArray[] = $value;
}

}

var_dump($newArray);

In the code, we first define an array $array containing null values. Next, we define a new array $newArray and use a foreach loop to iterate through the elements in the $array array. In the loop, we use an if statement to determine whether each element is null. If the element is not null, we add it to the $newArray array. Finally, you can see through the var_dump() function that null values ​​have been removed from the $newArray array.

3. Summary

In this article, we introduced how to remove null values ​​​​from arrays in PHP. We can use the array_filter() function or write code to loop through to achieve the removal operation. By handling null values ​​in arrays, we can make our PHP applications more robust and reliable.

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