百科狗gzencode() - zlib函数（压缩文件）
gzencode()
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
创建gzip压缩字符串
说明
gzencode (string $data[,int $level= -1 [,int $encoding_mode= FORCE_GZIP ]] ) : string
This function returns a compressed version of the input$datacompatible with the output of the gzip program.
For more information on the GZIP file format, see the document: » GZIP file format specification version 4.3 (RFC 1952).
参数
$dataThe data to encode.
$level压缩程度。如果不压缩到9，则可以指定为0。用于最大压缩。如果未给定，则默认压缩级别将。是zlib库的默认压缩级别。
$encoding_mode The encoding mode. Can be FORCE_GZIP (the default) or FORCE_DEFLATE.
Prior to PHP 5.4.0, using FORCE_DEFLATE results in a standard zlib deflated string (inclusive zlib headers) after a gzip file header but without the trailing crc32 checksum.
In PHP 5.4.0 and later, FORCE_DEFLATE generates RFC 1950 compliant output, consisting of a zlib header, the deflated data, and an Adler checksum.
返回值
The encoded string, or FALSE if an error occurred.
更新日志
| 版本 | 说明 |
|---|---|
| 5.4.0 | FORCE_DEFLATE now generates RFC 1950 compliant output. |
范例
The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.:
Creating a gzip file
参见
gzdecode()Decodes a gzip compressed stringgzdeflate()Deflate a stringgzinflate()Inflate a deflated stringgzuncompress()Uncompress a compressed stringgzcompress()Compress a string- » ZLIB Compressed Data Format Specification (RFC 1950)
Had some trouble finding the correct way to send a Content-Length header with HTTP compression. The pitch is to use gzencode (not gzdeflaten not gzcompress).
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