How to calculate the length of a non-empty array in php

When developing a website or application, processing arrays is an essential part of the work. In PHP, calculating the length of an array is a basic operation. Usually, we use count() function to count the number of elements in an array. However, sometimes we need to count the number of elements in an array that are not empty. This article will describe how to use PHP to calculate the length of a non-empty array.

Use the count() function

The count() function is one of PHP's built-in functions, used to count the number of elements in an array. For non-empty arrays, you can directly use the count() function to calculate the array length.

$myArray = array('apple', 'banana', 'orange');
$length = count($myArray);
echo $length; // 3

In the above code, $myArray is an array containing three elements. For non-empty arrays, you can directly use the count() function to get the length of the array.

Traverse the array calculation

If the array contains empty elements, you will not be able to get the correct array length using the count() function. In this case, we can iterate through the array and find the number of elements that are not empty.

$myArray = array('apple', '', 'banana', '', 'orange');
$length = 0;
foreach($myArray as $item) {
    if(!empty($item)) {
        $length++;
    }
}
echo $length; // 3

In the above code, $myArray is an array containing five elements. Use a foreach loop to traverse each element in the array, and use the empty() function to determine whether the element is empty. If the element is not empty, add one to the length.

Using the array_filter() function

Another way to calculate the length of a non-empty array is to use the array_filter() function. The function of array_filter() is to filter the elements in the array and return a new array.

$myArray = array('apple', '', 'banana', '', 'orange');
$filteredArray = array_filter($myArray);
$length = count($filteredArray);
echo $length; // 3

In the above code, the array_filter() function will filter out empty elements and return a new array. Use the count() function to calculate the length of the new array, which is the length of the array that is not empty.

Conclusion

Calculating the length of a non-empty array is a basic operation when processing arrays. In addition to the count() function, we can also use array calculations or use the array_filter() function to calculate the length of a non-empty array. When actually developing an application, we need to choose an appropriate method to calculate the array length according to the specific situation.

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