search
HomeBackend DevelopmentPHP Tutorialphp iterator, php proxy_PHP tutorial

php iterator, php proxy_PHP tutorial

Jul 12, 2016 am 09:04 AM
currentimplementsiteratorphpdeviceaccomplishofIterate

php iterator, php proxy

implements Iterator, which implements Iterator's current(); next(); key(); valid(); rewind();

<span> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span>
<span> 3</span> <span> *先定义一个数组
</span><span> 4</span> <span> *定义第一个位置 $position = 0
</span><span> 5</span> <span> *然后返回key 和value,
</span><span> 6</span> <span> *指向下一个位置 ++$position
</span><span> 7</span>  <span>*/</span>  
<span> 8</span> <span>class</span> myIterator <span>implements</span><span> Iterator{
</span><span> 9</span>         <span>//</span><span>先定义一个位置</span>
<span>10</span>         <span>private</span> <span>$position</span>  = 0<span>;
</span><span>11</span>         <span>private</span> <span>$array</span><span>;
</span><span>12</span> 
<span>13</span>         <span>public</span> <span>function</span> __construct(<span>array</span> <span>$array</span><span>){
</span><span>14</span>             <span>$this</span>-><span>array</span> = <span>$array</span><span>;
</span><span>15</span> <span>        }
</span><span>16</span>         <span>/*</span><span>*
</span><span>17</span> <span>         * 倒带第一个元素的迭代器
</span><span>18</span> <span>         * @return void 任何返回值将被忽略.
</span><span>19</span>          <span>*/</span>
<span>20</span>         <span>public</span> <span>function</span> <span>rewind</span><span>(){
</span><span>21</span>             <span>var_dump</span>(<span>__METHOD__</span><span>);
</span><span>22</span>             <span>$this</span>->position = 0<span>;
</span><span>23</span> <span>        }
</span><span>24</span>         <span>/*</span><span>*
</span><span>25</span> <span>         * 检查当前位置是有效的
</span><span>26</span> <span>         * @return boolean 返回值将bool型布尔,然后评估
</span><span>27</span>          <span>*/</span>
<span>28</span>         <span>public</span> <span>function</span><span> valid(){
</span><span>29</span>             <span>var_dump</span>(<span>__METHOD__</span><span>);
</span><span>30</span>             <span>//</span><span>判断数组第一个元素是否存在</span>
<span>31</span>             <span>return</span> <span>isset</span>(<span>$this</span>-><span>array</span>[<span>$this</span>-><span>position]);
</span><span>32</span> <span>        }
</span><span>33</span>         <span>/*</span><span>*
</span><span>34</span> <span>         * 返回当前元素
</span><span>35</span> <span>         * @return mixed 可以返回任何类型。
</span><span>36</span>          <span>*/</span>
<span>37</span>         <span>public</span> <span>function</span> <span>current</span><span>(){
</span><span>38</span>             <span>var_dump</span>(<span>__METHOD__</span><span>);
</span><span>39</span>             <span>//</span><span>返回数组的第一个元素</span>
<span>40</span>             <span>return</span> <span>$this</span>-><span>array</span>[<span>$this</span>-><span>position];
</span><span>41</span> <span>        }
</span><span>42</span>         <span>/*</span><span>*
</span><span>43</span> <span>         * 返回当前元素的关键
</span><span>44</span> <span>         * @return mixed 标量成功,或null失败
</span><span>45</span>          <span>*/</span>
<span>46</span>         <span>public</span> <span>function</span> <span>key</span><span>(){
</span><span>47</span>             <span>var_dump</span>(<span>__METHOD__</span><span>);
</span><span>48</span>             <span>//</span><span>返回数组第一个元素的key</span>
<span>49</span>             <span>return</span> <span>$this</span>-><span>position;
</span><span>50</span> <span>        }
</span><span>51</span>         <span>/*</span><span>*
</span><span>52</span> <span>         * 前进到下一个元素
</span><span>53</span> <span>         * @return void 任何返回值将被忽略。
</span><span>54</span>          <span>*/</span>
<span>55</span>         <span>public</span> <span>function</span> <span>next</span><span>(){
</span><span>56</span>             <span>var_dump</span>(<span>__METHOD__</span><span>);
</span><span>57</span>             ++ <span>$this</span>-><span>position;
</span><span>58</span> <span>        }
</span><span>59</span> <span>    }
</span><span>60</span> 
<span>61</span> <span>$array</span>=<span>[
</span><span>62</span>         "firstelement",
<span>63</span>         "secondeleent",
<span>64</span>         "lastelement"
<span>65</span> <span>    ];
</span><span>66</span> 
<span>67</span> <span>$it</span> = <span>new</span> myIterator(<span>$array</span><span>);
</span><span>68</span> <span>foreach</span> (<span>$it</span> <span>as</span> <span>$key</span>=><span>$value</span><span>) {
</span><span>69</span>     <span>echo</span> <span>$key</span>.' => '.<span>$value</span><span>;
</span><span>70</span>     <span>echo</span> "<br>"<span>;
</span><span>71</span> } 

Execution result:

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1072323.htmlTechArticlephp iterator, php agent implements Iterator, implements Iterator's current();next(); key() ; valid();rewind(); 1 ? php 2 /* 3 *First define an array 4 *Define the first position $position...
Statement
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
How does PHP identify a user's session?How does PHP identify a user's session?May 01, 2025 am 12:23 AM

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

What are some best practices for securing PHP sessions?What are some best practices for securing PHP sessions?May 01, 2025 am 12:22 AM

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

Where are PHP session files stored by default?Where are PHP session files stored by default?May 01, 2025 am 12:15 AM

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita

How do you retrieve data from a PHP session?How do you retrieve data from a PHP session?May 01, 2025 am 12:11 AM

ToretrievedatafromaPHPsession,startthesessionwithsession_start()andaccessvariablesinthe$_SESSIONarray.Forexample:1)Startthesession:session_start().2)Retrievedata:$username=$_SESSION['username'];echo"Welcome,".$username;.Sessionsareserver-si

How can you use sessions to implement a shopping cart?How can you use sessions to implement a shopping cart?May 01, 2025 am 12:10 AM

The steps to build an efficient shopping cart system using sessions include: 1) Understand the definition and function of the session. The session is a server-side storage mechanism used to maintain user status across requests; 2) Implement basic session management, such as adding products to the shopping cart; 3) Expand to advanced usage, supporting product quantity management and deletion; 4) Optimize performance and security, by persisting session data and using secure session identifiers.

How do you create and use an interface in PHP?How do you create and use an interface in PHP?Apr 30, 2025 pm 03:40 PM

The article explains how to create, implement, and use interfaces in PHP, focusing on their benefits for code organization and maintainability.

What is the difference between crypt() and password_hash()?What is the difference between crypt() and password_hash()?Apr 30, 2025 pm 03:39 PM

The article discusses the differences between crypt() and password_hash() in PHP for password hashing, focusing on their implementation, security, and suitability for modern web applications.

How can you prevent Cross-Site Scripting (XSS) in PHP?How can you prevent Cross-Site Scripting (XSS) in PHP?Apr 30, 2025 pm 03:38 PM

Article discusses preventing Cross-Site Scripting (XSS) in PHP through input validation, output encoding, and using tools like OWASP ESAPI and HTML Purifier.

See all articles

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

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment