How to delete empty elements in php array (three methods)

In PHP development, we often need to operate and process arrays, and sometimes we need to delete empty elements from the array. This article will introduce how to delete empty elements in PHP arrays, and also explain in detail the method of deleting empty arrays in PHP.

1. Use the array_filter function to delete empty elements in an array

array_filter is a very important function in PHP. It can be used to filter elements in an array and return those that meet the conditions. element. To remove empty elements from an array, we can use the array_filter function.

The following is a sample code:

$arr = array('a', '', 'b', null, false, 0);

$arr = array_filter($arr);

print_r($arr);

The above code will output the following results:

Array
(
    [0] => a
    [2] => b
)

In the above code, we create an array containing empty elements. Through the array_filter function, we can delete all empty elements in the array. Finally, print out the processed array and you can see that the empty elements have been successfully removed.

2. Use foreach loop to delete empty elements in the array

In addition to the array_filter function, we can also use loop statements to delete empty elements in the array. The following is a sample code that uses a foreach loop to delete empty elements in an array:

$arr = array('a', '', 'b', null, false, 0);

foreach ($arr as $key => $value) {
    if (empty($value)) {
        unset($arr[$key]);
    }
}

print_r($arr);

The above code will output the following results:

Array
(
    [0] => a
    [2] => b
)

In the above code, we use a foreach loop statement to traverse the entire array . If an element is empty, we will use the unset function to delete the element. The final output array contains only non-empty elements.

3. Use the array_diff function to delete empty elements in an array

In addition to the array_filter function and foreach loop, we can also use the array_diff function to delete empty elements in a PHP array.

The following is a sample code:

$arr = array('a', '', 'b', null, false, 0);

$arr = array_diff($arr, array('', null, false, 0));

print_r($arr);

The above code will output the following results:

Array
(
    [0] => a
    [2] => b
)

In the above code, we use the array_diff function, which is used to Find the differences. We can delete all empty elements by passing an array containing empty elements and an array consisting of empty elements as parameters.

Summary

Deleting empty elements in an array in PHP can be achieved in a variety of ways, such as using the array_filter function, using a foreach loop statement, etc. The above example code should be able to provide you with some help and give you a better understanding of how to remove empty elements from a PHP array. I hope this article can help and enlighten you on the problems you encounter during development.

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