function getFilesize($num){ $p = 0; $format='bytes'; if($num>0 && $num<1024){ $p = 0; return sprintf("%.2f",number_format($num)).' '.$format; } if($num>=1024 && $num<pow(1024, 2)){ $p = 1; $format = 'KB'; } if ($num>=pow(1024, 2) && $num<pow(1024, 3)) { $p = 2; $format = 'MB'; } if ($num>=pow(1024, 3) && $num<pow(1024, 4)) { $p = 3; $format = 'GB'; } if ($num>=pow(1024, 4) && $num<pow(1024, 5)) { $p = 3; $format = 'TB'; } $num /= pow(1024, $p); return sprintf("%.2f",number_format($num, 3)).' '.$format; }getFilesize('10240')

代码：<?php /** * 检测文件的真实类型 * @param string $srcPath 文件路径 * @return string $realType 文件真实类型 */ $imgurl = 'https://ae01.alicdn.com/kf/HTB1w5xdS4TpK1RjSZR0762EwXXa7.png'; echo file_type_detect($imgurl); function file_type_detect($srcPath){ $types = array( 6677 => 'bmp', 7173 => 'gif', 7368 => 'mp3', 13780 => 'png', 255216 => 'jpg', ); $binary = curl_get($srcPath); $bytes = substr($binary, 0, 2); $head = @unpack('C2char', $bytes); $typeCode = intval($head['char1'].$head['char2']); $realType = isset($types[$typeCode]) ? $types[$typeCode] : $typeCode; return $realType; } function curl_get($url){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Linux; U; Android 4.4.1; zh-cn; R815T Build/JOP40D) AppleWebKit/533.1 (KHTML, like Gecko)Version/4.0 MQQBrowser/4.5 Mobile Safari/533.1'); curl_setopt($ch, CURLOPT_TIMEOUT, 10); $content=curl_exec($ch); curl_close($ch); return($content); } ?>

通过php代码来实现一些功能时或通过php代码来实现采集数据时，采集到的数据或多或少都会带有html代码以及一些冗余杂乱数据，要经过处理下替换或者过滤掉这些不需要的数据，为了效率可以使用php正则表达式来进行替换或者过滤，下面是一些实用的替换或者过滤数据的正则表达式php代码，使用这些正则表达式就可以很好的替换或者过滤一些不想要的冗余杂乱数据。$str=preg_replace("/<[\/\!]*?[^<>]*?>/","",$str); //替换或过滤所有html代码 $str=preg_replace("/\s+/", " ", $str); //替换或过滤多余回车 $str=preg_replace("/<[ ]+/si","<",$str); //替换或过滤<__("<"号后面带空格) $str=preg_replace("/<\!--.*?-->/si","",$str); //注释 $str=preg_replace("/<(\!.*?)>/si","",$str); //替换或过滤DOCTYPE $str=preg_replace("/<(\/?html.*?)>/si","",$str); //替换或过滤html标签 $str=preg_replace("/<(\/?head.*?)>/si","",$str); //替换或过滤head标签 $str=preg_replace("/<(\/?meta.*?)>/si","",$str); //替换或过滤meta标签 $str=preg_replace("/<(\/?body.*?)>/si","",$str); //替换或过滤body标签 $str=preg_replace("/<(\/?link.*?)>/si","",$str); //替换或过滤link标签 $str=preg_replace("/<(\/?form.*?)>/si","",$str); //替换或过滤form标签 $str=preg_replace("/cookie/si","COOKIE",$str); //替换或过滤COOKIE标签 $str=preg_replace("/<(applet.*?)>(.*?)<(\/applet.*?)>/si","",$str); //替换或过滤applet标签 $str=preg_replace("/<(\/?applet.*?)>/si","",$str); //替换或过滤applet标签 $str=preg_replace("/<(style.*?)>(.*?)<(\/style.*?)>/si","",$str); //替换或过滤style标签 $str=preg_replace("/<(\/?style.*?)>/si","",$str); //替换或过滤style标签 $str=preg_replace("/<(title.*?)>(.*?)<(\/title.*?)>/si","",$str); //替换或过滤title标签 $str=preg_replace("/<(\/?title.*?)>/si","",$str); //替换或过滤title标签 $str=preg_replace("/<(object.*?)>(.*?)<(\/object.*?)>/si","",$str); //替换或过滤object标签 $str=preg_replace("/<(\/?objec.*?)>/si","",$str); //替换或过滤object标签 $str=preg_replace("/<(noframes.*?)>(.*?)<(\/noframes.*?)>/si","",$str); //替换或过滤noframes标签 $str=preg_replace("/<(\/?noframes.*?)>/si","",$str); //替换或过滤noframes标签 $str=preg_replace("/<(i?frame.*?)>(.*?)<(\/i?frame.*?)>/si","",$str); //替换或过滤frame标签 $str=preg_replace("/<(\/?i?frame.*?)>/si","",$str); //替换或过滤frame标签 $str=preg_replace("/<(script.*?)>(.*?)<(\/script.*?)>/si","",$str); //替换或过滤script标签 $str=preg_replace("/<(\/?script.*?)>/si","",$str); //替换或过滤script标签 $str=preg_replace("/javascript/si","Javascript",$str); //替换或过滤script标签 $str=preg_replace("/vbscript/si","Vbscript",$str); //替换或过滤script标签 $str=preg_replace("/on([a-z]+)\s*=/si","On\\1=",$str); //替换或过滤script标签 $str=preg_replace("/&#/si","&＃",$str); //替换或过滤script标签，如javAsCript:alert(