Home php教程 php手册 PHP中array_slice函数用法介绍

PHP中array_slice函数用法介绍

Jun 13, 2016 am 11:19 AM
array php slice introduce function article usage of

文章专门来详细的介绍了array_slice函数的详细用法以及一些常用的array_slice实例程序,有需要了解的同学可看看。  

array_slice() 函数在数组中根据条件取出一段值,并返回。

注释:如果数组有字符串键,所返回的数组将保留键名。(参见例子 4)

语法
array_slice(array,offset,length,preserve)

函数在数组中根据条件取出一段值,并返回
参数 
array  必需。规定输入的数组。
offset  必需。数值。规定取出元素的开始位置。如果是正数,则从前往后开始取,如果是负值,从后向前取 offset 绝对值。
length  可选。数值。规定被返回数组的长度。如果是负数,则从后向前,选取该值绝对值数目的元素。如果未设置该值,则返回所有元素。
preserve 可选。可能的值:true – 保留键 false – 默认 – 重置键

 

当为0的时候,将里面的值赋值给一个新的变量,最后返回这个变量。
今天闲着翻了一下手册,原来这东西是有现成的函数的:array_slice。

 代码如下 复制代码

    $arr = array(0,1,2,3,4);

    var_dump(array_slice($arr,0,2));
   
   
    echo "
";
   
    $arr2 = array('a'=>array('a','a','a'),'b'=>array('b','b','b'));
   
    var_dump(array_slice($arr2,0,1));
?>

返回的结果如下:

 代码如下 复制代码
array(2) { [0]=> int(0) [1]=> int(1) }
array(1) { ["a"]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "a" [2]=> string(1) "a" } }

我找到了array_slice函数。非常好用,分享一下:

 代码如下 复制代码

//假定一个结果集二维数组:

   $arr = array(array('name'=> 'name1','sex' => 'sex1','job' => 'job1'),
              array('name'=> 'name2','sex' => 'sex2','job' => 'job2'),
              array('name'=> 'name3','sex' => 'sex3','job' => 'job3'),
              array('name'=> 'name4','sex' => 'sex4','job' => 'job4'),
              array('name'=> 'name5','sex' => 'sex5','job' => 'job5'),
              array('name'=> 'name6','sex' => 'sex6','job' => 'job6'),
              array('name'=> 'name7','sex' => 'sex7','job' => 'job7'),
              array('name'=> 'name8','sex' => 'sex8','job' => 'job8'),
              array('name'=> 'name9','sex' => 'sex9','job' => 'job9'),
              array('name'=> 'name10','sex' => 'sex10','job' => 'job10'),
              array('name'=> 'name11','sex' => 'sex11','job' => 'job11'),
              array('name'=> 'name12','sex' => 'sex12','job' => 'job12'),
     );

 
 //计算总记录条数
 $num = count($arr);
 //规定每页显示的条数
 $perpage = 3;
 //计算页数
 $pages = ceil($num/$perpage);
 //echo $num,$perpage,$pagecount;exit;
 if(is_numeric($_REQUEST['page']))
 {
  if($_REQUEST['page']    $page = 1;
  }elseif($_REQUEST['page']>$pages)
  {
   $page = $pages;
  }else{
  $page = $_REQUEST['page'];
   }
 }else{
  $page = 1;
 }
 $start = ($page-1)*$perpage;
 $newpage = array_slice($arr,$start,$perpage,true);
 //print_r($newpage);exit;
?>


 
 
 
 
 
 foreach($newpage as $k => $v)
{
?>
 
 
 
 
 

 

}
?>

name sex job

if($page>1){
 echo "首页";
 echo "上一页";
}
if($page {
 echo "下一页";
 echo "末页";
}
?>

 


Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP Working with Database CakePHP Working with Database Sep 10, 2024 pm 05:25 PM

Working with database in CakePHP is very easy. We will understand the CRUD (Create, Read, Update, Delete) operations in this chapter.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles