<?php

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/**

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* 提示操作信息的，并且跳转

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* @param string $mes

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* @param string $url

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*/

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function alertMes($mes,$url){

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echo "<script type='text/javascript'>alert('{$mes}');location.href='{$url}';</script>";

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}

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/**

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* 截取文件扩展名

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* @param string $filename

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* @return string

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*/

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function getExt($filename){

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return strtolower(pathinfo($filename,PATHINFO_EXTENSION));

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}

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/**

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* 产生唯一名称

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* @param int $length

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* @return string

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*/

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function getUniqidName($length=10){

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return substr(md5(uniqid(microtime(true),true)),0,$length);

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}

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