本文详细介绍了array_slice函数的详细用法以及一些常用的array_slice实例程序,分享给大家供大家参考。具体分析如下：

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。

代码如下:
复制代码 代码如下:<?php
    $arr = array(0,1,2,3,4);
    var_dump(array_slice($arr,0,2));
    
    echo "<br/>";
    $arr2 = array("a"=>array("a","a","a"),"b"=>array("b","b","b"));
    var_dump(array_slice($arr2,0,1));
?>

返回的结果如下:
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" } }

array_slice函数实现的分页方法非常好用,分享如下:
复制代码 代码如下:<?php
//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"]<1){
   $page = 1;
  }elseif($_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($newpage);exit;
?>
<table cellpadding="0" cellspacing="0" border="1">
 <tr>
  <td>name</td>
  <td>sex</td>
  <td>job</td>
 </tr>
<?php
 foreach($newpage as $k => $v)
{
?>
 <tr>
  <td><?php echo  $v["name"]; ?></td>
  <td><?php echo  $v["sex"]; ?></td>
  <td><?php echo  $v["job"]; ?></td>
 </tr>
<?php
}
?>
</table>
<?php
if($page>1){
 echo "<a href="?page=1">首页</a>";
 echo "<a href="?page=".($page-1)."">上一页</a>";
}
if($page<$pages)
{
 echo "<a href="?page=".($page+1)."">下一页</a>";
 echo "<a href="?page=".$pages."">末页</a>";
}
?>

希望本文所述对大家的PHP程序设计有所帮助。