以前写过一篇关于在php中将一个文件的大小(以字节为单位)，转化成以合适的单位（B，KB，MB，GB）来表示的教程教程，由于博主个人习惯把一些不重要的逻辑放到用户的浏览器中去执行，也就是用JS来处理。所以就写了一个利用 js 来将文件大小转化为B KB MB GB为单位的转化方法。例1：js 字节转换成 B KB MB GB 的方法js函数代码：<script> function sizeTostr(size) { var data = ""; if (size < 0.1 * 1024) { //如果小于0.1KB转化成B data = size.toFixed(2) + "B"; } else if (size < 0.1 * 1024 * 1024) {//如果小于0.1MB转化成KB data = (size / 1024).toFixed(2) + "KB"; } else if (size < 0.1 * 1024 * 1024 * 1024) { //如果小于0.1GB转化成MB data = (size / (1024 * 1024)).toFixed(2) + "MB"; } else { //其他转化成GB data = (size / (1024 * 1024 * 1024)).toFixed(2) + "GB"; } var sizestr = data + ""; var len = sizestr.indexOf("\."); var dec = sizestr.substr(len + 1, 2); if (dec == "00") {//当小数点后为00时 去掉小数部分 return sizestr.substring(0, len) + sizestr.substr(len + 3, 2); } return sizestr; } </script>函数调用方法：<script> console.log(sizeTostr(1000)); console.log(sizeTostr(102400)); console.log(sizeTostr(10240000)); console.log(sizeTostr(1000111111)); </script>输出结果：0.98KB 100KB 9.77MB 0.93GB例2：js实现KB、MB、GB、TB单位转换看了上面中例1的代码，是不是感觉很简单，只是一些数据的比较，那么接下来看一下例2的代码。js函数代码：<script> // c 参数：表示要被转化的容量大小，以字节为单 // b 参数：表示如果转换时出小数，四舍五入保留多少位 默认为2位小数 function formatBytes(a, b) { if (0 == a) return "0 B"; var c = 1024, d = b || 2, e = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"], f = Math.floor(Math.log(a) / Math.log(c)); return parseFloat((a / Math.pow(c, f)).toFixed(d)) + " " + e[f]; } </script>函数的调用：<script> console.log(formatBytes(1234)); console.log(formatBytes(1234, 3)); console.log(formatBytes(123400, 3)); console.log(formatBytes(12340000, 3)); console.log(formatBytes(12340000000, 3)); console.log(formatBytes(12340000000000, 3)); console.log(formatBytes(1234000000000000, 3)); </script>输出值：1.21 KB 1.205 KB 120.508 KB 11.768 MB 11.493 GB 11.223 TB 1.096 PB

代码：<?php function teacher_curl($url, $paras = array()) { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); if (@$paras['Header']) { $Header = $paras['Header']; } else { $Header[] = "Accept:*/*"; $Header[] = "Accept-Encoding:gzip,deflate,sdch"; $Header[] = "Accept-Language:zh-CN,zh;q=0.8"; $Header[] = "Connection:close"; } curl_setopt($ch, CURLOPT_HTTPHEADER, $Header); if (@$paras['ctime']) { // 连接超时 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $paras['ctime']); } else { curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); } if (@$paras['rtime']) { // 读取超时 curl_setopt($ch, CURLOPT_TIMEOUT, $paras['rtime']); } if (@$paras['post']) { curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $paras['post']); } if (@$paras['header']) { curl_setopt($ch, CURLOPT_HEADER, true); } if (@$paras['cookie']) { curl_setopt($ch, CURLOPT_COOKIE, $paras['cookie']); } if (@$paras['refer']) { if ($paras['refer'] == 1) { curl_setopt($ch, CURLOPT_REFERER, 'http://m.qzone.com/infocenter?g_f='); } else { curl_setopt($ch, CURLOPT_REFERER, $paras['refer']); } } if (@$paras['ua']) { curl_setopt($ch, CURLOPT_USERAGENT, $paras['ua']); } else { curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"); } if (@$paras['nobody']) { curl_setopt($ch, CURLOPT_NOBODY, 1); } curl_setopt($ch, CURLOPT_ENCODING, "gzip"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); if (@$paras['GetCookie']) { curl_setopt($ch, CURLOPT_HEADER, 1); $result = curl_exec($ch); preg_match_all("/Set-Cookie: (.*?);/m", $result, $matches); $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE); $header = substr($result, 0, $headerSize); //状态码 $body = substr($result, $headerSize); //响应内容 $ret = [ "Cookie" => $matches, "body" => $body, "code" => $header ]; curl_close($ch); return $ret; } $ret = curl_exec($ch); if (@$paras['loadurl']) { $Headers = curl_getinfo($ch); $ret = $Headers['redirect_url']; } curl_close($ch); return $ret; }使用方法文档GET访问echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545");POST访问echo teacher_curl("http://api.4dn.net/djyule/djyule.php",[ 'post'=>[ 'id'=>'385545' ] ]);或echo teacher_curl("http://api.4dn.net/djyule/djyule.php ",[ 'post'=>'id=385545' ]);携带Cookie访问echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545 ",[ 'cookie'=>'cookie内容' ]);模拟访问来源Referecho teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545 ",[ 'refer'=>'http://api.4dn.net' ]);模拟UseaAgentecho teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'ua'=>'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36' ]);文件上传echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'post'=>[ 'file'=>new CURLFile(realpath("Curl.jpg")) ] ]);或echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'post'=>new CURLFile(realpath("Curl.jpg")) ]);获取301跳转地址echo teacher_curl("https://mmbizurl.cn/s/RNHSo6Dek",[ 'loadurl'=>1 ]);查看返回Header信息echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'header'=>1 ]);设置请求头信息echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'Header'=>[ 'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3 accept-encoding: gzip, deflate, br accept-language: zh-CN,zh;q=0.9 cache-control: max-age=0' ] ]);获取POST以后返回的Header、Body、Cookie内容echo teacher_curl("http://api.4dn.net/djyule/djyule.php?id=385545",[ 'post'=>[ 'user'=>123456, 'pwd'=>123 ], 'GetCookie'=>1 ]);

PHP实现解析xml为数组简单方法<?php $xml_data=file_get_contents("xml地址或xml数据"); $xml =simplexml_load_string($xml_data); $xmljson= json_encode($xml); $xml=json_decode($xmljson,true); print_r($xml);