What is the commonly used function to define arrays in php?

In PHP, two common functions for defining arrays are: array() function: generates an indexed array with keys as numbers. [] Short syntax: Generate an indexed array with keys in order starting from 0.

Common functions to define arrays in PHP

In PHP, there are two common methods to define arrays:

1. array() function

<code class="php">$array = array(1, 2, 3, 4, 5);</code>

2. [] Short syntax

This syntax was introduced in PHP 5.4 and higher.

<code class="php">$array = [1, 2, 3, 4, 5];</code>

Detailed description:

• array() function: Generate an index array, each element uses the keys 0, 1 , 2, ... and other numerical keys for indexing.
• [] Short syntax: also generates an indexed array, but it is more concise.

Which function to choose?

• #Use the array() function: When array keys need to be specified explicitly. For example:

  <code class="php">$array = array("key1" => 1, "key2" => 2, "key3" => 3);</code>

• Use [] short syntax: When you need to create an index array, the keys of the array are numbers and start from 0 in order . For example:

  <code class="php">$array = [1, 2, 3, 4, 5];</code>

Note:

• The values ​​in the array can be of any data type, including other arrays.
• Arrays are passed by value, which means modifications to the array do not affect the original array.

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