deflate_add
(PHP 7)
deflate_add — Incrementally deflate data
Описание
string deflate_add
( resource
$context
, string $data
[, int $flush_mode = ZLIB_SYNC_FLUSH
] )Incrementally deflates data in the specified context.
Список параметров
-
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 setZLIB_NO_FLUSHto maximize compression, andZLIB_FINISHto terminate with the last chunk of data. See the » zlib manual for a detailed description of these constants.
Возвращаемые значения
Returns a chunk of compressed data, или FALSE в случае возникновения ошибки.
Ошибки
If invalid arguments are given, an error of level
E_WARNING is generated.
Смотрите также
- deflate_init() - Initialize an incremental deflate context
Коментарии
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'));