PHP 4, PHP 5, PHP 7, PHP 8
gzwrite - Binary-safe gz-file write
Code Examples

gzwrite( resource$stream, string$data, [int|null$length = null] ): int|false

gzwrite writes the contents of data to the given gz-file.



The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen.


The string to write.


The number of uncompressed bytes to write. If supplied, writing will stop after length (uncompressed) bytes have been written or the end of data is reached, whichever comes first.

Return Values

Returns the number of (uncompressed) bytes written to the given gz-file stream, or false on failure.


Version Description
8.0.0 length is nullable now; previously, the default was 0.
7.4.0 This functions returns false on failure now; previously 0 was returned.

Related Functions

Example of gzwrite

Show all examples for gzwrite

PHP Version:

Function gzwrite:

Zlib Compression Functions

Most used PHP functions