# gzdeflate

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gzdeflate — Deflate a string

### 说明

gzdeflate(string `$data`, int `$level` = -1, int `$encoding` = `ZLIB_ENCODING_RAW`): string|false

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.

### 示例

示例 #1 gzdeflate() example

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

### 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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