我想使用 PHP 在我的服务器上 gzip 压缩文件。有人有一个输入文件并输出压缩文件的例子吗?
这段代码可以解决问题
// Name of the file we're compressing
$file = "test.txt";
// Name of the gz file we're creating
$gzfile = "test.gz";
// Open the gz file (w9 is the highest compression)
$fp = gzopen ($gzfile, 'w9');
// Compress the file
gzwrite ($fp, file_get_contents($file));
// Close the gz file and we're done
gzclose($fp);
此处的其他答案在压缩期间将整个文件加载到内存中,这将导致大文件出现“内存不足”错误。下面的函数在大文件上应该更可靠,因为它以 512kb 块读取和写入文件。
/**
* GZIPs a file on disk (appending .gz to the name)
*
* From http://stackoverflow.com/questions/6073397/how-do-you-create-a-gz-file-using-php
* Based on function by Kioob at:
* http://www.php.net/manual/en/function.gzwrite.php#34955
*
* @param string $source Path to file that should be compressed
* @param integer $level GZIP compression level (default: 9)
* @return string New filename (with .gz appended) if success, or false if operation fails
*/
function gzCompressFile($source, $level = 9){
$dest = $source . '.gz';
$mode = 'wb' . $level;
$error = false;
if ($fp_out = gzopen($dest, $mode)) {
if ($fp_in = fopen($source,'rb')) {
while (!feof($fp_in))
gzwrite($fp_out, fread($fp_in, 1024 * 512));
fclose($fp_in);
} else {
$error = true;
}
gzclose($fp_out);
} else {
$error = true;
}
if ($error)
return false;
else
return $dest;
}
更新: Gerben 发布了此函数的改进版本,该版本更清晰并使用异常,而不是在错误时返回 false。请参阅https://stackoverflow.com/a/56140427/195835
wrappers,compression those。只需对代码进行最小的更改,您就可以在 gzip、bzip2 或 zip 之间切换。
$input = "test.txt";
$output = $input.".gz";
file_put_contents("compress.zlib://$output", file_get_contents($input));
将
compress.zlib://
更改为
compress.zip://
以进行 zip 压缩
compress.bzip2://
更改为 bzip2 压缩。
/**
* Compress a file using gzip
*
* Rewritten from Simon East's version here:
* https://stackoverflow.com/a/22754032/3499843
*
* @param string $inFilename Input filename
* @param int $level Compression level (default: 9)
*
* @throws Exception if the input or output file can not be opened
*
* @return string Output filename
*/
function gzcompressfile(string $inFilename, int $level = 9): string
{
// Is the file gzipped already?
$extension = pathinfo($inFilename, PATHINFO_EXTENSION);
if ($extension == "gz") {
return $inFilename;
}
// Open input file
$inFile = fopen($inFilename, "rb");
if ($inFile === false) {
throw new \Exception("Unable to open input file: $inFilename");
}
// Open output file
$gzFilename = $inFilename.".gz";
$mode = "wb".$level;
$gzFile = gzopen($gzFilename, $mode);
if ($gzFile === false) {
fclose($inFile);
throw new \Exception("Unable to open output file: $gzFilename");
}
// Stream copy
$length = 512 * 1024; // 512 kB
while (!feof($inFile)) {
gzwrite($gzFile, fread($inFile, $length));
}
// Close files
fclose($inFile);
gzclose($gzFile);
// Return the new filename
return $gzFilename;
}
$bytes = file_put_contents($destination, gzopen($gzip_path, r));
exec
、
system
、
shell_exec
),您可以使用它们来简单地
gzip
文件。
exec("gzip ".$filename);
注意: 在使用 $filename
变量之前,请务必对其进行适当的清理,特别是当它来自用户输入时(但不仅如此)。它可用于运行任意命令,例如包含类似
my-file.txt && anothercommand
(或
my-file.txt; anothercommand
)之类的内容。
function gzCompressFile($source, $level = 9)
{
$tarFile = $source . '.tar';
if (is_dir($source)) {
$tar = new PharData($tarFile);
$files = scandir($source);
foreach ($files as $file) {
if (is_file($source . '/' . $file)) {
$tar->addFile($source . '/' . $file, $file);
}
}
}
$dest = $tarFile . '.gz';
$mode = 'wb' . $level;
$error = false;
if ($fp_out = gzopen($dest, $mode)) {
if ($fp_in = fopen($tarFile, 'rb')) {
while (!feof($fp_in))
gzwrite($fp_out, fread($fp_in, 1024 * 512));
fclose($fp_in);
} else {
$error = true;
}
gzclose($fp_out);
unlink($tarFile);
} else {
$error = true;
}
if ($error)
return false;
else
return $dest;
}
除非你尝试提取它,否则你不会知道