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# $\_SESSION ## **$\_SESSION** **Session的配置与应用** ``` <pre class="calibre17">``` <span class="token4">session_start</span><span class="token3">(</span><span class="token3">)</span><span class="token3">;</span> <span class="token">//初始化session.需在文件头部</span> $_SESSION<span class="token3">[</span>name<span class="token3">]</span><span class="token1">=</span>value<span class="token3">;</span> <span class="token">//配置Seeeion</span> echo $_SESSION<span class="token3">[</span>name<span class="token3">]</span><span class="token3">;</span> <span class="token">//使用session</span> <span class="token4">isset</span><span class="token3">(</span>$_SESSION<span class="token3">[</span>name<span class="token3">]</span><span class="token3">)</span><span class="token3">;</span> <span class="token">// 判断</span> <span class="token4">unset</span><span class="token3">(</span>$_SESSION<span class="token3">[</span>name<span class="token3">]</span><span class="token3">)</span><span class="token3">;</span> <span class="token">//删除</span> <span class="token4">session_destroy</span><span class="token3">(</span><span class="token3">)</span>； <span class="token">//销毁所有session</span> ``` ```