Let's talk about the creation and assignment methods of php arrays

PHP array is a data type often used for data storage and processing. In PHP, you can use multiple methods to create and assign arrays. This article will introduce the main methods to create and assign arrays.

1. Specify the array elements directly

The easiest way to create an array is to directly specify the array elements. In PHP, you can define an array using square brackets and separating array elements with commas. For example:

$movies = array("The Shawshank Redemption", "The Godfather", "The Dark Knight");

In the above example, we specified an array of three string elements using the array() function. Using this approach you can add or remove elements at will and assign them to variables.

2. Use the range() function to create an array

PHP also provides a way to quickly create a range-based array of numbers, which can be done by using the range ()Function completed. range()The function accepts three parameters: starting point, end point and step size, and creates an array of numbers within the specified range. For example:

$numbers = range(1, 10, 2);

In the above example, we use the range() function to create an array, starting from 1 and arranging every 2 numbers until the end of 10. This produces the following array:

array(1, 3, 5, 7, 9)

3. Create an array using the array_fill() function

If you need to create a large array with the same values, you can use PHP's built-in array_fill()Function. array_fill()The function accepts 3 parameters: starting index value, array length and fill value. For example:

$ids = array_fill(0, 10, 5);

In the above example, we used the array_fill() function to create an array of length 10 in which all elements are filled with 5. The generated array is as follows:

array(5, 5, 5, 5, 5, 5, 5, 5, 5, 5)

4. Create an array using key-value pairs

Arrays in PHP can not only use numeric indexes, but also string indexes. Using strings as indexes is often more purposeful and can make code more readable and understandable. For example:

$books = array(
  "Hitchhiker's Guide to the Galaxy" => "Douglas Adams",
  "1984" => "George Orwell",
  "Brave New World" => "Aldous Huxley"
);

In the above example, we create an associative array using strings as the key values ​​of the array. Associative arrays store elements using key-value pairs and provide a way to access data using key names. Generate associative arrays as follows:

array(
  "Hitchhiker's Guide to the Galaxy" => "Douglas Adams",
  "1984" => "George Orwell",
  "Brave New World" => "Aldous Huxley"
)

5. Use range() and array_combine() functions to create arrays

PHP also provides a array_combine() function , you can use two arrays to create key-value pairs. The first array contains the key names and the second array contains the key values. For example, you can use the range() function to generate numbers in an array, and the array_combine() function to associate each number with a key value. The code is as follows:

$keys = range(1, 3);
$values = array("first", "second", "third");
$combined = array_combine($keys, $values);

In the above example, we used the range() function to generate the numbers 1 to 3 for the $keys array, using array The () function generates three string values ​​for the $values array. We then combine the two arrays using the array_combine() function to correspond numeric keys to string values. The generated array is as follows:

array(
  1 => "first",
  2 => "second",
  3 => "third"
)

Array assignment is one of the very basic operations in PHP. We can use a variety of methods to create and operate arrays, which can meet different needs. Proficient use of array assignment methods can help us complete PHP development tasks faster.

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