In PHP, there are many ways to define arrays. Here are some commonly used methods.
- Literal method
Use literal method to define arrays directly in the code:
$arr1 = [1, 2, 3]; $arr2 = ['apple', 'banana', 'orange'];
- array() function
The array() function is a built-in function in PHP that can be used to create arrays. Its basic syntax is as follows:
array(value1, value2, value3, ...)
where value1, value2, value3, etc. represent each element in the array, which can be any type of value. For example:
$arr1 = array(1,2,3); $arr2 = array('apple', 'banana', 'orange'); $arr3 = array(1, 'apple', true);
- Associative array
Associative array refers to using specified key-value pairs to define an array, that is, you can customize the key name, which can be a string or a number. Mixed types are also possible. The definition of an associative array is as follows:
$arr = [ 'name' => '张三', 'age' => 28, 'gender' => '男' ];
The way to define an associative array using the array() function is as follows:
$arr = array( 'name' => '张三', 'age' => 28, 'gender' => '男' );
- Multidimensional array
Multidimensional array refers to is an array that contains other arrays. You can use nested array syntax to define multi-dimensional arrays, as shown below:
$arr = [ [1, 2, 3], ['apple', 'banana', 'orange'], ['name' => '张三', 'age' => 28], [ [1, 2], [3, 4] ] ];
The way to define multi-dimensional arrays using the array() function is as follows:
$arr = array( array(1,2,3), array('apple', 'banana', 'orange'), array('name' => '张三', 'age' => 28), array( array(1, 2), array(3, 4) ) );
In PHP, the methods of defining arrays are There are many ways, whether using literals, array() function, associative arrays or multi-dimensional arrays, to meet different needs. Programmers can choose the method that suits them based on the specific situation.
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