How to get certain values in an array in php

3 ways to obtain: 1. Use "$array name[subscript]" to obtain one by one. 2. Use array_slice() to get several consecutive element values, the syntax is "array_slice(array, starting position, number)" or "array_slice(array, - position)". 3. Use array_splice() to get several consecutive elements Element value, syntax "array_splice(array, starting position, number)" or "array_splice(array, - position)".

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

php provides a variety of methods to get certain values in the array, let’s take a look below.

Situation 1: Get several discontinuous element values

In PHP, you can use the "$array name[subscript]" statement to get them one by one.

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

"; echo "获取第3位的元素：".$arr[2]."
"; echo "获取第6位的元素：".$arr[5]."
"; ?>

Case 2: Get several consecutive element values

Method 1. Use array_slice() function

array_slice() function is PHP A function provided to intercept an array and extract a fragment from the array.

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

This function supports 2 required parameters:$arrayand$start, two omitted parameters$lengthand$preserve.

Parameter$arraydoes not need to be introduced. , the parameter$startis used to specify the position (subscript) to start interception, and the parameter$lengthindicates the interception length (if omitted, it will intercept from the specified subscript to the end of the array ).

The output result is:

The parameter$startcan be a negative number, then the distance from the end of $array-Start at the position of(that is, position from the right side of the array to the left according to the absolute value), and intercept from the back to the front. For example,-2means starting from the penultimate element of the array .

The output result is:

2. Use array_splice() function

array_splice() function When deleting some elements of the array, the deleted elements will be formed into a new array, and then the new array will be returned.

Usearray_splice($array,$start,$length)The function can intercept an array fragment of the specified length (the value of$length) based on the array subscript (the value of$start).

Let’s look at the following small example:

The output result is:

$startIf the value is negative, get the last N elements

Note:array_splice() function will change the original array.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to get certain values in an array in php. For more information, please follow other related articles on the PHP Chinese website!