# 调试

echo "<pre>";

print_r($var);

echo "</pre>";

die();

# 输出年份

 <?php echo date('Y');?>

# 正则匹配到2个字符串之间的内容

<?php

$preg= '/xue[\s\S]*?om/i';

    preg_match_all($preg,"学并思网址xuebingsi.com",$res);

var_dump($res[0][0]);    # string(13) "xuebingsi.com"

?>

# 获取url域名

function test($url = ''){

$ex = explode('/',$url);

return $ex[2];

}

$url = "http://hongji.zg02.com/l/psj/";

echo test($url);      # hongji.zg02.com

# 获取url链接后缀

function url($url = ''){

$urlexp = explode('/',$url);

return $urlexp[3];   # /?id=5

}