What are the assignment methods for php arrays?

php array assignment methods include direct assignment, assignment using the array() function, assignment using the index, assignment using the range() function, assignment using key-value pairs, and use of loop assignment, etc. Detailed introduction: 1. Direct assignment, assign value directly when the array is declared, such as "$arr = [1, 2, 3];"; 2. Use the array() function to assign value, such as "$arr = array(1, 2, 3);"; 3. Use index assignment, etc.

The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

php array is a very commonly used data structure used to store a set of related data. In PHP, there are many ways to assign values ​​to arrays.

1. Direct assignment:

The simplest way is to assign the value directly when the array is declared. For example:

$arr = [1, 2, 3];

This creates an array containing three elements, with elements 1, 2 and 3 respectively.

2. Use the array() function to assign values:

Another common way is to use the array() function to assign values. For example:

$arr = array(1, 2, 3);

This also creates an array containing three elements.

3. Use index assignment:

The elements of the array can be assigned by index. The index can be a number or a string. For example:

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$arr[0] = 1;
$arr[1] = 2;
$arr[2] = 3;

or:

$arr['name'] = 'John';
$arr['age'] = 25;
$arr['city'] = 'New York';

In this way, the first number of the array is given respectively. Assign values ​​to the first, second and third elements, or to the 'name', 'age' and 'city' keys of an associative array.

4. Use the range() function to assign values:

The range() function can be used to generate an array containing elements within a specified range. For example:

$arr = range(1, 10);

This creates an array containing elements from 1 to 10.

5. Use key-value pairs to assign values:

You can use key-value pairs to assign values. For example:

$arr = ['name' => 'John', 'age' => 25, 'city' => 'New York'];

This creates an associative array in which the value of the 'name' key is 'John', the value of the 'age' key is 25, and the value of the 'city' key for 'New York'.

6. Use loop assignment:

You can use loops to assign values ​​to arrays. For example:

   $arr = [];
   for ($i = 0; $i < 10; $i++) {
       $arr[] = $i;
   }

This creates an array containing elements from 0 to 9.

To sum up, the assignment methods for PHP arrays include direct assignment, assignment using array() function, assignment using index, assignment using range() function, assignment using key-value pairs and using loops. Assignment and other methods. According to different needs and scenarios, choosing the appropriate way to assign values ​​can improve the readability and efficiency of the code.

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