How does a function in php return the length of an array?

PHP is a very popular language and many web developers use it to develop websites and applications. In PHP, array is an important data type that can contain a set of data and can be processed through many built-in functions. This article will introduce how to get the length of an array in PHP.

In PHP, the count() function is usually used to obtain the length of an array. This function can return the number of elements in an array. For example:

$fruits = array("apple", "banana", "orange");
echo count($fruits); // 输出 3

In the above example, we declared an array $fruits containing 3 elements, and then used the count() function to obtain its length, and the output was 3.

If you want to calculate the length of a multidimensional array, you can use the second parameter of the count() function to specify the depth. For example:

$zebras = array(
    array("name" => "A", "age" => 5),
    array("name" => "B", "age" => 6),
    array("name" => "C", "age" => 7)
);
echo count($zebras, COUNT_RECURSIVE); // 输出 6

In the above example, we declared an array $zebras containing 3 associative arrays, and then used the count() function to calculate its length, and the output was 6. Among them, the second parameter COUNT_RECURSIVE means calculating the total number of elements of the multi-dimensional array.

In addition to the count() function, you can also use the sizeof() function to obtain the length of the array. The functions of these two functions are the same. For example:

$books = array("PHP", "JavaScript", "HTML");
echo sizeof($books); // 输出 3

In short, it is very convenient to get the length of an array in PHP. You can use the built-in count() function or sizeof() function. You only need to pass the array as a parameter of the function.

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