将Session写入Memcache，sessionmemcache_PHP教程
- WBOY原创
- 2016-07-13 09:57:55809浏览
将Session写入Memcache，sessionmemcache
通过session_set_save_handler()方法自定义Session写入Memcache
<span> 1</span> <?<span>php
</span><span> 2</span> <span>class</span><span> MemSession{
</span><span> 3</span> <span>private</span> <span>static</span> <span>$handler</span> = <span>null</span><span>;
</span><span> 4</span> <span>private</span> <span>static</span> <span>$lifetime</span> = <span>null</span><span>;
</span><span> 5</span> <span>private</span> <span>static</span> <span>$time</span> = <span>null</span><span>;
</span><span> 6</span> <span>const</span> MS = 'session'<span>;
</span><span> 7</span>
<span> 8</span> <span>private</span> <span>static</span> <span>function</span> init(<span>$handler</span><span>){
</span><span> 9</span> self::<span>$handler</span> = <span>$handler</span><span>;
</span><span>10</span> self::<span>$lifetime</span> = <span>ini_get</span>('session.gc_maxlifetime'<span>);
</span><span>11</span> self::<span>$time</span> = <span>time</span><span>();
</span><span>12</span> <span> }
</span><span>13</span>
<span>14</span> <span>public</span> <span>static</span> <span>function</span> start(<span>$memcache</span><span>){
</span><span>15</span> self::init(<span>$memcache</span><span>);
</span><span>16</span> <span>//</span><span>调用类中的方法要用数组,__CLASS__代表本类</span>
<span>17</span> <span>session_set_save_handler</span><span>(
</span><span>18</span> <span>array</span>(<span>__CLASS__</span>,'open'),
<span>19</span> <span>array</span>(<span>__CLASS__</span>,'close'),
<span>20</span> <span>array</span>(<span>__CLASS__</span>,'read'),
<span>21</span> <span>array</span>(<span>__CLASS__</span>,'write'),
<span>22</span> <span>array</span>(<span>__CLASS__</span>,'destroy'),
<span>23</span> <span>array</span>(<span>__CLASS__</span>,'gc'<span>)
</span><span>24</span> <span> );
</span><span>25</span> <span>session_start</span><span>();
</span><span>26</span> <span> }
</span><span>27</span>
<span>28</span> <span>public</span> <span>static</span> <span>function</span> open(<span>$path</span>,<span>$name</span><span>){
</span><span>29</span>
<span>30</span> <span> }
</span><span>31</span> <span>public</span> <span>static</span> <span>function</span><span> close(){
</span><span>32</span>
<span>33</span> <span> }
</span><span>34</span>
<span>35</span> <span>public</span> <span>static</span> <span>function</span> read(<span>$PHPSESSID</span><span>){
</span><span>36</span> <span>$val</span> = self::<span>$handler</span>->get(self::session_key(<span>$PHPSESSID</span><span>));
</span><span>37</span>
<span>38</span> <span>if</span>(<span>$val</span>===<span>false</span> || <span>$val</span>==<span>null</span><span>){
</span><span>39</span> <span>return</span> <span>false</span><span>;
</span><span>40</span> <span> }
</span><span>41</span> <span>return</span> <span>$val</span><span>;
</span><span>42</span> <span> }
</span><span>43</span> <span>public</span> <span>static</span> <span>function</span> write(<span>$PHPSESSID</span>,<span>$data</span><span>){
</span><span>44</span> <span>$method</span> = <span>$data</span>? 'set':'replace'<span>;
</span><span>45</span> <span>return</span> self::<span>$handler</span>-><span>$method</span>(self::session_key(<span>$PHPSESSID</span>),<span>$data</span>,MEMCACHE_COMPRESSED,self::<span>$lifetime</span><span>);
</span><span>46</span> <span> }
</span><span>47</span>
<span>48</span> <span>public</span> <span>static</span> <span>function</span> destroy(<span>$PHPSESSID</span><span>){
</span><span>49</span> <span>return</span> self::<span>$handle</span>->delete(self::session_key(<span>$PHPSESSID</span><span>));
</span><span>50</span> <span> }
</span><span>51</span> <span>//</span><span>memcache本身就有限定时间，数据自动销毁，所以可不使用gc方法</span>
<span>52</span> <span>public</span> <span>static</span> <span>function</span> gc(<span>$lifetime</span><span>){
</span><span>53</span> <span>return</span> <span>true</span><span>;
</span><span>54</span> <span> }
</span><span>55</span>
<span>56</span> <span>//</span><span>给sessionID加前缀，避免key重复</span>
<span>57</span> <span>private</span> <span>static</span> <span>function</span> session_key(<span>$PHPSESSID</span><span>){
</span><span>58</span> <span>$session_key</span> = self::MS.<span>$PHPSESSID</span><span>;
</span><span>59</span> <span>return</span> <span>$session_key</span><span>;
</span><span>60</span> <span> }
</span><span>61</span> <span> }
</span><span>62</span> <span>$mem</span> = <span>new</span><span> Memcache;
</span><span>63</span> <span>$mem</span>->connect("localhost",11211) or <span>die</span>("could not connect"<span>);
</span><span>64</span> MemSession::start(<span>$mem</span>);
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