How to declare and use an array in PHP?

1 year ago
Ava Mitchell
2 minutes

In PHP, arrays can be declared and used using the following method:

  1. You can declare an array using the array() function and assign it directly to a variable, for example:
$numbers = array(1, 2, 3, 4, 5);
  1. You can use square brackets [] to declare an array and assign it directly to a variable, for example:
$numbers = [1, 2, 3, 4, 5];
  1. A way to declare an associative array is by specifying keys and values, which can be directly assigned to a variable, for example:
$person = array('name' => 'John', 'age' => 30, 'gender' => 'male');
  1. One way to declare an associative array is by using square brackets ([ ]) to specify the keys and values, and then assign it directly to a variable, for example:
$person = ['name' => 'John', 'age' => 30, 'gender' => 'male'];

You can utilize the following methods to work with arrays:

  1. Accessing elements in an array can be done by specifying the index of the element, such as:
echo $numbers[0]; // 输出：1
  1. To access elements in an associative array, you can access them by specifying the key in the associative array, for example:
echo $person['name']; // 输出：John
  1. You can add new elements to an array by specifying an index or key, for example:
$numbers[] = 6; // 添加新元素到普通数组
$person['occupation'] = 'engineer'; // 添加新元素到关联数组
  1. You can traverse an array using a foreach loop to iterate through all of its elements, for example:
foreach ($numbers as $number) {
    echo $number;
}

foreach ($person as $key => $value) {
    echo $key . ': ' . $value;
}

The above are some common statements and methods for using arrays, depending on the actual needs, other array functions can also be used to operate on arrays.

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