如何在 Codeigniter 中按页码取消设置会话数据最多 n 页？

Question

$this->session->unset_userdata('current_page_'.$pagenumber);

通过使用此代码，我正在为每个页码从会话中取消设置数据，但问题是在某些时候我不知道会话中存在多少页数据，例如：

$this->session->unset_userdata('current_page_'.1);
$this->session->unset_userdata('current_page_'.2);
$this->session->unset_userdata('current_page_'.3);
$this->session->unset_userdata('current_page_'.4);
.
.
.
$this->session->unset_userdata('current_page_'.?????);

有什么方法可以取消设置像 "current_page_%" 这样的密钥的会话中的数据提前致谢。

Answer 1

试试这个

$j = 1;
for($i=0;$i==$j;$i++)
{
    if($this->session->userdata('current_page_'.$i))
    {
        $this->session->unset_userdata('current_page_'.$i);
        $j++;
    }else
    {
        break;
    }
}

Answer 2

此语句将打印所有会话数据，您可以从中获取所有页码。

print_r($this->session->all_userdata());

Answer 3

这应该适合你：

（这里我只是使用 preg_grep() to get all array elements which follows the pattern. To match the keys and not the values I use array_keys() 来获取所有键。然后我只是用 foreach 循环遍历匹配项并取消设置数组元素）

<?php


    //As an example v Here just use your array
    $array = array("current_page_1" => 1, "current_page_1345" => 2, "current_page_12" => 3, "current_page_34" => 4, "xy" => 5, "z" => 6);
    $sub = preg_grep("/(current_page_)\d+/", array_keys($array));

    foreach($sub as $v)
        unset($array[$v]);  //$this->session->unset_userdata($v);

    print_r($array);

?>

输出：

Array ( [xy] => 5 [z] => 6 )

Answer 4

您可以尝试搜索会话的首字母 （即 current_page_） 并相应地取消设置。

<?php
function startsWith($haystack, $needle) {
    // search backwards starting from haystack length characters from the end
    return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== FALSE;
}

foreach($this->session->all_userdata() as $key => $value)
{
    if(startsWith($key, 'current_page_'))
        $this->session->unset_userdata($key);
}

例如：

<?php
function startsWith($haystack, $needle) {
    // search backwards starting from haystack length characters from the end
    return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== FALSE;
}

$session = array(
            'current_page_12' => 'abc', 
            'current_page_qw1' => 'xyz', 
            'hello' => 'world', 
            'current_page_23d' => 'mno', 
            'example' => '112'
        );

foreach($session as $key => $value)
{
    if(startsWith($key, 'current_page_'))
        unset($session[$key]);
}

print_r($session);

输出：

Array
(
    [hello] => world
    [example] => 112
)

演示：
http://3v4l.org/uh4HK

如何在 Codeigniter 中按页码取消设置会话数据最多 n 页？

How to unset session data by page number upto n pages in Codeigniter?

php

session

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