What is the new declaration method for php arrays?

As PHP continues to develop, its code can implement more and more functions. Arrays are one of the common data types in PHP, and their expressions can be divided into two types: indexed arrays and associative arrays. In past versions, we usually used the array() function to declare arrays, but from PHP 5.4 onwards, we can use a more concise way to declare arrays.

In this article, we will introduce in detail the new declaration methods of PHP arrays, including the declaration methods of simple arrays, the declaration methods of associative arrays, the declaration methods of multi-dimensional arrays, etc., and also discuss the consequences of using these methods. Analyze the advantages.

1. New declaration method for simple arrays

Simple arrays include index arrays and associative arrays. We can use the new declaration method to create them. The new declaration method uses square brackets [] instead of the original array() function, for example:

$arr = [1, 2, 3, 4, 5]; //索引数组
$assoc_arr = ['name' => 'Tom', 'age' => '25']; //关联数组

Using the new declaration method can make the code more concise and readable, especially when declaring smaller arrays. Ability to code and debug faster. At the same time, when the code is submitted to code hosting platforms such as GitHub, the number of bytes of the code can also be reduced, thereby speeding up the transmission and loading of the code.

2. New declaration method of associative array

When using the original array() function to declare an associative array, you need to assign a key-value pair to each element, for example:

$assoc_arr = array(
    'name' => 'Tom',
    'age' => '25',
    'location' => 'Shanghai'
);

Using the new declaration method, we can directly write the key-value pairs inside square brackets [], and separate the key and value by the => symbol, for example:

$assoc_arr = [
    'name' => 'Tom',
    'age' => '25',
    'location' => 'Shanghai'
];

Compared with the original declaration method, The new method is more concise and easy to understand, more in line with general human reading habits, and can improve the code reading experience and efficiency.

3. New declaration method for multi-dimensional arrays

In multi-dimensional arrays, we need to use the nested array() function to declare the array, for example:

$multi_arr = array(
    array('name' => 'Tom', 'age' => 25),
    array('name' => 'Jerry', 'age' => 30),
    array('name' => 'Mike', 'age' => 45)
);

Use new We can also use square brackets [] to declare multi-dimensional arrays, for example:

$multi_arr = [
    ['name' => 'Tom', 'age' => 25],
    ['name' => 'Jerry', 'age' => 30],
    ['name' => 'Mike', 'age' => 45]
];

The new declaration method makes code nesting clearer, easier to read and write, and also improves the maintainability of the code. performance and scalability.

4. Analysis of the advantages of the new declaration method for PHP arrays

1. Code simplicity: the new declaration method reduces the amount of code, shortens the number of lines of code, and improves the readability of the code performance and maintainability.
2. Improving efficiency: New methods enable faster writing and debugging of code when declaring smaller arrays, while also improving efficiency in code transfer and loading.
3. More readable: The new method is more in line with human reading habits, reduces people's cognitive load when reading code, and helps people understand the code logic and intent more easily.
4. More flexible: The new method supports more operations and is suitable for more scenarios, such as nesting of multi-dimensional arrays, serialization and deserialization of objects, etc., and has a wider range of applications.

In short, the new PHP array declaration method has advantages in code development, transmission and loading, and has a positive effect on writing efficient, readable, maintainable and scalable code. We hope to promote and use these new declaration methods more to improve PHP development efficiency and code quality.

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