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if条件判断中,0,NULL,‘‘都是false
session方法
session(‘_userID‘, $userInfo[‘userID‘]);
//切换数据库
$infoClass = M()->db(1,C(‘DB_CONFIG_SYN‘))->table(‘syn_userinfo‘);
//字符串替换
<?php
echo strtr("Hilla Warld","ia","eo");
?>
输出:Hello World
//编码转换
$content = iconv("utf-8","gb2312//IGNORE",$content);
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原文地址:http://www.cnblogs.com/log8/p/4324221.html