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);

 

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6.PHP获取数组长度：

$i=count($array_name);

 

7. PHP获得当前时间：

$current_date = date("Ymd");