//php 获取图片后缀
//第1种方法：
function get_extension($file)
{
substr(strrchr($file, '.'), 1);
}
//第2种方法：
function get_extension($file)
{
return substr($file, strrpos($file, '.')+1);
}
//第3种方法：
function get_extension($file)
{
$arr = explode('.', $file);
return end($arr);
}
//第4种方法：
function get_extension($file)
{
$info = pathinfo($file);
return $info['extension'];
}
//第5种方法：
function get_extension($file)
{
return pathinfo($file, PATHINFO_EXTENSION);
}
/**
* @Author: Ding Jianlong
* @Date: 2019-03-07 16:14:04
* @Last Modified by: Ding Jianlong
* @Last Modified time: 2019-03-20 13:45:12
*/
header('content-type:text/html;charset=utf-8');
//获取顶级域名
function getTopHost($url){
$url = strtolower($url); //首先转成小写
$hosts = parse_url($url);
$host = $hosts['host'];
//查看是几级域名
$data = explode('.', $host);
$n = count($data);
//判断是否是双后缀
$preg = '/[\w].+\.(com|net|org|gov|edu)\.cn$/';
if(($n > 2) && preg_match($preg,$host)){
//双后缀取后3位
$host = $data[$n-3].'.'.$data[$n-2].'.'.$data[$n-1];
}else{
//非双后缀取后两位
$host = $data[$n-2].'.'.$data[$n-1];
}
return $host;
}
/**
* 能用的随机数生成
* @param string $type 类型 alpha/alnum/numeric/nozero/unique/md5/encrypt/sha1
* @param int $len 长度
* @return string
*/
function build($type = 'alnum', $len = 8)
{
switch ($type) {
case 'alpha':
case 'alnum':
case 'numeric':
case 'nozero':
switch ($type) {
case 'alpha':
$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'alnum':
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'numeric':
$pool = '0123456789';
break;
case 'nozero':
$pool = '123456789';
break;
}
return substr(str_shuffle(str_repeat($pool, ceil($len / strlen($pool)))), 0, $len);
case 'unique':
case 'md5':
return md5(uniqid(mt_rand()));
case 'encrypt':
case 'sha1':
return sha1(uniqid(mt_rand(), true));
}
}
//纯数字的四位随机数
//rand(1000,9999)
//数字和字符混搭的四位随机字符串：
function GetRandStr($len)
{
$chars = array(
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
"3", "4", "5", "6", "7", "8", "9"
);
$charsLen = count($chars) - 1;
shuffle($chars);
$output = "";
for ($i=0; $i<$len; $i++)
{
$output .= $chars[mt_rand(0, $charsLen)];
}
return $output;
}
//echo GetRandStr(4);
/**
* 生成不重复的随机数
* @param int $start 需要生成的数字开始范围
* @param int $end 结束范围
* @param int $length 需要生成的随机数个数
* @return array 生成的随机数
*/
function get_rand_number($start=1,$end=10,$length=4){
$connt=0;
$temp=array();
while($connt<$length){
$temp[]=mt_rand($start,$end);
$data=array_unique($temp);
$connt=count($data);
}
sort($data);
return $data;
}
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