Briefly describe how to create a one-dimensional array in php

In PHP, array is one of the most important data types and one of the commonly used data structures. Arrays can store multiple values, each of which can be assigned a specified key to access a specific value. A one-dimensional array is an array with only one dimension, containing one or more values. Let's briefly describe how to create a one-dimensional array in PHP.

One-dimensional arrays in PHP can be created in the following two ways:

1. Direct assignment creation

The simplest way to create a one-dimensional array is directly Assignment creation, for example:

$names = array("Alice", "Bob", "Charlie", "Dave");

In the above code, we created a one-dimensional array named $names, which contains 4 elements Alice, Bob, Charlie, and Dave. These four values ​​can be accessed through their subscripts, which start from 0 and increase in sequence.

You can access the elements in the array in the following ways:

echo $names[0]; //输出Alice
echo $names[2]; //输出Charlie

2. Create using the array() function

The array() function is a commonly used one in PHP The function can be used to create a one-dimensional array, for example:

$numbers = array(1, 2, 3, 4, 5);

In the above code, we created a one-dimensional array named $numbers, which contains 5 elements 1, 2, 3, 4 ,5.

You can access the elements in the array in the following ways:

echo $numbers[0]; //输出1
echo $numbers[3]; //输出4

You can use an associative array to assign key values ​​to the array, for example:

$student = array(
    'name' => 'Tom',
    'age' => 19,
    'gender' => 'male'
);

The above code uses an associative array to assign The array specifies three keys, and the corresponding values ​​are Tom, 19, and male. These values ​​can be accessed through the key name of the array, for example:

echo $student['name']; //输出Tom
echo $student['gender']; //输出male

Summary:

In PHP, one-dimensional arrays can be created by direct assignment or using the array() function. For associative arrays, we can assign a key name to the array elements for easy access. When accessing an array, you need to use the subscript or key value corresponding to the array element to access.

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