How to remove hollow elements from an array in php

In PHP, removing empty elements is a common operation, especially when processing arrays returned by forms or databases. If you directly use foreach loop processing, you can use if conditional statements to determine whether it is empty, but this method requires a larger amount of code and lower execution efficiency. Therefore, we can use the array functions provided by PHP to remove empty elements from the array.

First, we can use the array_filter function to remove empty elements in the array. The array_filter function can filter elements in an array and return elements in the array that meet certain conditions. When the second parameter is not passed in, this function filters out empty elements in the array by default.

For example, the following is an array containing empty elements:

$arr = array("dog", "", "cat", "", "mouse");

Use the array_filter function to remove empty elements:

$newArr = array_filter($arr);
print_r($newArr);
// 输出：Array ( [0] => dog [2] => cat [4] => mouse )

As you can see, after removing empty elements, a The new array $newArr contains only non-empty elements. With this method we can easily remove empty elements from the array.

In addition to the array_filter function, we can also use the array_diff function to remove empty elements in the array. The array_diff function compares two arrays and returns the difference between the two arrays. Therefore, if we pass an empty array as a parameter, we can get a new array containing only non-empty elements.

For example, the following is an array containing empty elements:

$arr = array("dog", "", "cat", "", "mouse");

Use the array_diff function to remove empty elements:

$newArr = array_diff($arr, array(""));
print_r($newArr);
// 输出：Array ( [0] => dog [2] => cat [4] => mouse )

Similarly, after removing empty elements, a new The array $newArr contains only non-empty elements.

In actual development, we usually need to perform multiple operations on the array, and may need to remove multiple elements in the array. We can do this by combining the array_filter and array_diff functions.

For example, the following is an array containing empty elements and 0s:

$arr = array("dog", "", "cat", 0, "mouse");

Use the following code to remove empty elements and 0s in the array:

$newArr = array_diff(array_filter($arr), array("", 0));
print_r($newArr);
// 输出：Array ( [0] => dog [2] => cat [4] => mouse )

Use this method , we can eliminate multiple elements in the array at one time, simplifying the code and improving efficiency.

Summary:

In PHP, removing empty elements from an array is a very common operation. We can use the array_filter function or array_diff function to remove empty elements. By using multiple functions together, we can remove multiple elements from the array at once, thereby simplifying the code and improving efficiency.

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