PHP Manual
Zlib 函数
Deflate a string

gzdeflate

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gzdeflate — Deflate a string

说明

gzdeflate ( string $data [, int $level = -1 [, int $encoding = ZLIB_ENCODING_RAW ]] ) : string

This function compresses the given string using the DEFLATE data format.

For details on the DEFLATE compression algorithm see the document "» DEFLATE Compressed Data Format Specification version 1.3" (RFC 1951).

参数

data: The data to deflate.
level: The level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If not given, the default compression level will be the default compression level of the zlib library.
encoding: One of ZLIB_ENCODING_* constants.

返回值

The deflated string or FALSE if an error occurred.

范例

Example #1 gzdeflate() example

 <?php
$compressed = gzdeflate('Compress me', 9);
echo $compressed;
?>

更新日志

版本	说明
5.4.0	Added `encoding` parameter.

参见

gzinflate() - Inflate a deflated string
gzcompress() - Compress a string
gzuncompress() - Uncompress a compressed string
gzencode() - Create a gzip compressed string

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