deflate_add

(PHP 7, PHP 8)

deflate_add — Incrementally deflate data

说明

deflate_add(DeflateContext $context, string $data, int $flush_mode = ZLIB_SYNC_FLUSH): string|false

Incrementally deflates data in the specified context.

参数

context: A context created with deflate_init().
data: A chunk of data to compress.
flush_mode: One of ZLIB_BLOCK, ZLIB_NO_FLUSH, ZLIB_PARTIAL_FLUSH, ZLIB_SYNC_FLUSH (default), ZLIB_FULL_FLUSH, ZLIB_FINISH. Normally you will want to set ZLIB_NO_FLUSH to maximize compression, and ZLIB_FINISH to terminate with the last chunk of data. See the » zlib manual for a detailed description of these constants.

返回值

Returns a chunk of compressed data, 或者在失败时返回 false.

错误／异常

If invalid arguments are given, an error of level E_WARNING is generated.

更新日志

版本	说明
8.0.0	`context` expects a DeflateContext instance now; previously, a resource was expected.

参见

deflate_init() - Initialize an incremental deflate context

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douglasjam at gmail dot com ¶

6 years ago

Example about to use deflate functions to write a gzip encoded file in chunks.

<?php

$handler = fopen('/tmp/test.csv', 'w');
$deflateContext = deflate_init(ZLIB_ENCODING_GZIP, ['level' => 9]);

$strings = [
'Hello, how are you?' . PHP_EOL,
'I am fine thanks' . PHP_EOL,
'Hello, how are you?' . PHP_EOL,
];

foreach ($strings as $string) {
fwrite($handler, deflate_add($deflateContext, $string, ZLIB_NO_FLUSH));
}

fwrite($handler, deflate_add($deflateContext, '', ZLIB_FINISH));
fclose($handler);

echo gzdecode(file_get_contents('/tmp/test.csv'));