PHP相关语法
1.PHP获得字符串长度：$length = strlen($str);
2.PHP判断字符是否为NULL:
if(!$str){
echo "false"
}else {
echo "true"
}
3.link_to的使用：
<?php echo link_to($question->getUser(), 'user/show?id='.$question->getUserId()) ?>
4.PHP截取字符串：
1.split
$arr = array();
$arr = split("/",$str);
5. PHP替换字符串：
1. str_replace("-" , "/" , $str)
"-" = 要替换的字符
"/" = 替换后的字符
2.按数组方式替换：
$arr = array("0","1","2","3","4","5","6","7","8","9");
$repNum2 = str_replace($arr,"",$str);
http://www.yfeshop.cn/html/NETboke/200905/yongphpcaozuoerjinzhiwenjian-youerjinzhicaozuojingyanderenjinlaigeioujiedayixiaxiaba-xiexieya-_13760.html
6.PHP获取数组长度：
$i=count($array_name);
7. PHP获得当前时间：
$current_date = date("Ymd");
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