How to remove empty elements from php array

PHP is one of the most popular open source web development languages ​​in the world. In PHP, array is a very common data type used to save a group of related data. In actual development, we often need to filter and process the data in the array, such as removing empty elements in the array. This article will introduce how to remove empty elements from an array in PHP.

1. Use the array_filter() function

The array_filter() function can be used to filter elements in an array and return a new array, in which a callback function can be specified to determine whether the elements need to be retained. . When this callback function returns true, the element will be retained in the new array, and when it returns false, it will not be retained.

Therefore, we can use the array_filter() function to filter empty elements in the array. The specific steps are as follows:

$arr = array("apple", "", "banana", null, "orange", "peach", false, " ");
$res = array_filter($arr, function($v){
    return !empty($v) || $v === 0;
});
print_r($res);

In the above code, we create an array $arr containing empty elements, and then use the array_filter() function to filter the array. The function of the callback function is to determine whether the element is empty or false. If not, it returns true, indicating that the element needs to be retained in the new array. The $res array is the result after removing empty elements.

2. Use the foreach() loop

In addition to using the array_filter() function, we can also use the foreach() loop to filter empty elements in the array. The specific steps are as follows:

$arr = array("apple", "", "banana", null, "orange", "peach", false, " ");
$res = array();
foreach ($arr as $v){
    if(!empty($v) || $v === 0){
        $res[] = $v;
    }
}
print_r($res);

In the above code, we first create a new array $res, and then use foreach() to loop through all elements in the original array $arr. If the element is non-null or false, it is added to the new array $res. Finally, the $res array is the result after removing the empty elements.

3. Use the array_diff() function

In addition to the above two methods, we can also use the array_diff() function to remove empty elements in the array. The specific steps are as follows:

$arr = array("apple", "", "banana", null, "orange", "peach", false, " ");
$res = array_diff($arr, array("", null, false));
print_r($res);

In the above code, we use the array_diff() function to compare the original array $arr with an array containing empty elements, and take the difference between the two arrays as the result. Since empty elements are considered the same when compared, we can remove them this way.

4. Summary

This article introduces three different methods to remove empty elements in PHP arrays, including using the array_filter() function, using the foreach() loop and using the array_diff() function . Since different methods have their own advantages and disadvantages, in actual development, specific problems should be analyzed in detail to choose the most appropriate method.

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