PHP filesize() 函数

filesize

作用：函数返回指定文件的大小

语法：

filesize(filename)

参数：

filename：必需。规定要检查的文件。

返回值：

返回文件大小的字节数，如果出错返回 FALSE 并生成一条 E_WARNING 级的错误。

filesize 示例

示例一

<?php// 输出类似：somefile.txt: 1024 bytes$filename = 'somefile.txt';echo $filename . ': ' . filesize($filename) . ' bytes';?>

示例二

<?phpfunction human_filesize($bytes, $decimals = 2) {  $sz = 'BKMGTP';  $factor = floor((strlen($bytes) - 1) / 3);  return sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . @$sz[$factor];}?>

示例三

<?php/*** Converts bytes into human readable file size.** @param string $bytes* @return string human readable file size (2,87 Мб)* @author Mogilev Arseny*/function FileSizeConvert($bytes){    $bytes = floatval($bytes);        $arBytes = array(            0 => array(                "UNIT" => "TB",                "VALUE" => pow(1024, 4)            ),            1 => array(                "UNIT" => "GB",                "VALUE" => pow(1024, 3)            ),            2 => array(                "UNIT" => "MB",                "VALUE" => pow(1024, 2)            ),            3 => array(                "UNIT" => "KB",                "VALUE" => 1024            ),            4 => array(                "UNIT" => "B",                "VALUE" => 1            ),        );    foreach($arBytes as $arItem)    {        if($bytes >= $arItem["VALUE"])        {            $result = $bytes / $arItem["VALUE"];            $result = str_replace(".", "," , strval(round($result, 2)))." ".$arItem["UNIT"];            break;        }    }    return $result;}?>

示例四

<?php/*** Return file size (even for file > 2 Gb)* For file size over PHP_INT_MAX (2 147 483 647), PHP filesize function loops from -PHP_INT_MAX to PHP_INT_MAX.** @param string $path Path of the file* @return mixed File size or false if error*/function realFileSize($path){    if (!file_exists($path))        return false;    $size = filesize($path);       if (!($file = fopen($path, 'rb')))        return false;       if ($size >= 0)    {//Check if it really is a small file (< 2 GB)        if (fseek($file, 0, SEEK_END) === 0)        {//It really is a small file            fclose($file);            return $size;        }    }       //Quickly jump the first 2 GB with fseek. After that fseek is not working on 32 bit php (it uses int internally)    $size = PHP_INT_MAX - 1;    if (fseek($file, PHP_INT_MAX - 1) !== 0)    {        fclose($file);        return false;    }       $length = 1024 * 1024;    while (!feof($file))    {//Read the file until end        $read = fread($file, $length);        $size = bcadd($size, $length);    }    $size = bcsub($size, $length);    $size = bcadd($size, strlen($read));       fclose($file);    return $size;}

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