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With the arrival of PHP 7, developers are eager to learn about the new features and functions. One of the problems is how to determine whether an array is an index array. The following article will introduce how to use the array_is_list() function in PHP 7 to determine whether an array is an indexed array.
What is an index array?
In PHP, an indexed array is a common array type. Its keys are integers, starting from 0 and increasing, and the values can be any type of data. For example:
$myArray = array("apple", "banana", "orange");
In the above example, $myArray is an indexed array because its keys start increasing from 0 and its values are strings.
How to determine whether an array is an index array?
In PHP 7, you can use the array_is_list() function to check whether an array is an indexed array. The array_is_list() function returns a Boolean value of true or false. Its syntax is as follows:
bool array_is_list ( array $array )
where $array is the array to be checked. Here is a sample program:
$myArray = array("apple", "banana", "orange");
$isList = array_is_list($myArray);
if ($isList) {
echo "The array is a list.";
} else {
echo "The array is not a list.";
}
When you run the above program, you will see the following output:
The array is a list.
In this example, we use array_is_list() Function checks whether $myArray is an indexed array. Since the keys of $myArray are incremented, the array_is_list() function returns true.
Summary
In PHP 7, when you need to determine whether an array is an index array, you can use the array_is_list() function. This function returns true or false, so you can determine whether an array is an indexed array based on the return value.
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