php>
<span> <?<span php><span> <span><span><span> <span><span> <span by www.jbxue.com><span> <span> <span> <span function> cleanGlobal(<span>, <span>, <span> = <span true>, <span> = <span null><span><span> <span> <span if>(<span key_exists>(<span>, <span>) && <span>[<span>] != <span null> && <span>[<span>] != ""<span><span> <span if>(<span><span><span> <span return> <span htmlspecialchars>(<span>[<span><span><span> } <span else><span><span> <span return> <span>[<span><span><span> <span><span> } <span else><span><span> <span return> <span><span><span> <span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
主要是用到了key_exists函数与htmlspecialchars函数，关于这二个函数的用法，大家可以参考w3school手册上的介绍。
