Where does the subscript of php array start?

The subscript of php starts from 0. The subscript of the first element of the array is 0, the subscript of the second element is 1, and so on. You can also use associative arrays in PHP, and the subscripts of associative arrays can use any string, not just numerical values.

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

The subscript of the php array starts from 0, which means that the subscript of the first element of the array is 1, the subscript of the second element is 2, and so on.

In PHP, when using an array, the way to declare and initialize the array is as follows:

// 声明一个空数组
$array = array();
// 声明并初始化一个数组
$array = array('apple', 'banana', 'orange');
 
// 访问数组元素
echo $array[0]; // 输出: apple
echo $array[1]; // 输出: banana
echo $array[2]; // 输出: orange

You can see that you can access the i-th element in the array using "$array[i]" elements. The value of i starts from 0 and ends with the number of elements in the array minus 1.

In PHP, you can also use associative arrays. An associative array is an array of key-value pairs, where each key is associated with a unique string. The declaration and access of an associative array are as follows:

// 声明并初始化一个关联数组
$fruit = array('apple' => 1, 'banana' => 2, 'orange' => 3);
 
// 访问关联数组元素
echo $fruit['apple']; // 输出: 1
echo $fruit['banana']; // 输出: 2
echo $fruit['orange']; // 输出: 3

In an associative array, the value of the key represents the index position in the array. Unlike ordinary array subscripts, the key value of an associative array can be any string, not just a numerical value.

In general, it is a very common practice to use array subscripts starting from 0 in PHP. If there is no special need, it is best to follow this standard to maintain code consistency and readability.

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