PHP filesize() 函数
发布:smiling 来源: PHP粉丝网 添加日期:2022-07-20 14:46:39 浏览: 评论:0
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
- <?php
- function 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;
- }
Tags: filesize
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