Can PHP array return specified elements?

PHP array can return specified elements. Three methods: 1. Use the "$array variable name [subscript]" statement to obtain an element of the specified subscript in the array; 2. Use array_slice() to obtain one or more consecutive elements of the specified subscript in the array. The syntax "array_slice( $arr, subscript, number of elements)"; 3. Use array_splice() to obtain one or more consecutive elements of the specified subscript in the array, the syntax is "array_slice($arr, subscript, number of elements)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

PHP array can return specified elements.

In PHP, there are many ways to return specified array elements. Three are introduced below:

Method 1: Use "$array variable name[below subscript]" to get the specified element

"$array variable name[subscript]"You can access an element of the specified subscript in the array

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
var_dump($arr);
echo "数组下标为0的元素：".$arr[0]."<br>";
echo "数组下标为2的元素：".$arr[2]."<br>";
echo "数组下标为3的元素：".$arr[3]."<br>";
?>

Method 2: Use the array_slice() function to obtain the element of the specified subscript in the array

The array_slice() function is a function provided by PHP to intercept the array. A fragment can be extracted from an array. Let's take a look at the array_slice() function:

array_slice($array,$start,$length,$preserve)

This function supports 2 required parameters: $array and $start, and two omitted parameters $length and $preserve.

There is no need to introduce the parameter $array. The parameter $start is used to specify the position (subscript) to start interception. The parameter $length indicates the interception length (if omitted, it will start from the specified subscript). intercepted until the end of the array).

If you want to intercept only one element, the value of parameter $length can be 1.

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
var_dump($arr);
echo "截取下标为2的数组元素：";
$result = array_slice($arr,2,1); //截取下标为2的数组元素
var_dump($result);
echo "截取下标为1的数组元素：";
$result = array_slice($arr,1,1); //截取下标为1的数组元素
var_dump($result);
?>

If you want to intercept N consecutive elements, the value of parameter $length can be N.

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
var_dump($arr);
echo "截取下标为1和2的数组元素：";
$result = array_slice($arr,1,2); //截取下标为1和2的数组元素
var_dump($result);
?>

Method 3: Use the array_splice() function to get the element with the specified subscript in the array

array_splice() function is deleting the array When a part of the elements is removed, these deleted elements will be formed into a new array, and then the new array will be returned; therefore, the array_splice() function can be used to intercept array fragments.

array_splice(array,start,length)

Same as the array_slice() function, the parameter $start is used to specify the starting position (subscript) of interception, and the parameter $length indicates the interception length (if omitted, it will intercept from the specified subscript to the array) end).

• If you want to intercept only one element, the value of the parameter $length is 1.

• If you want to intercept N consecutive elements, the value of parameter $length can be N.

<?php
header("Content-type:text/html;charset=utf-8");
$arr= array("香蕉","苹果","梨子","橙子","橘子","榴莲");
var_dump($arr);
echo "截取下标为2的数组元素：";
$result = array_slice($arr,2,1); //截取下标为2的数组元素
var_dump($result);
echo "截取下标为1的数组元素：";
$result = array_slice($arr,1,1); //截取下标为1的数组元素
var_dump($result);
echo "截取下标为3,4的数组元素：";
$result = array_slice($arr,3,2); //截取下标为3,4的数组元素
var_dump($result);
?>

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