Summery Summery
Decompression of deflated string while staying compatible with the majority of servers.
Syntax Syntax
Description Description
Certain Servers will return deflated data with headers which PHP’s gzinflate() function cannot handle out of the box. The following function has been created from various snippets on the gzinflate() PHP documentation.
Warning: Magic numbers within. Due to the potential different formats that the compressed data may be returned in, some "magic offsets" are needed to ensure proper decompression takes place. For a simple progmatic way to determine the magic offset in use, see: https://core.trac.wordpress.org/ticket/18273
Parameters Parameters
- $gzData
-
(Required) String to decompress.
Return Return
(string|bool) False on failure.
Source Source
File: wp-includes/class-wp-http-encoding.php
* @return string|bool False on failure. */ public static function compatible_gzinflate( $gzData ) { // Compressed data might contain a full header, if so strip it for gzinflate(). if ( "\x1f\x8b\x08" === substr( $gzData, 0, 3 ) ) { $i = 10; $flg = ord( substr( $gzData, 3, 1 ) ); if ( $flg > 0 ) { if ( $flg & 4 ) { list($xlen) = unpack( 'v', substr( $gzData, $i, 2 ) ); $i = $i + 2 + $xlen; } if ( $flg & 8 ) { $i = strpos( $gzData, "\0", $i ) + 1; } if ( $flg & 16 ) { $i = strpos( $gzData, "\0", $i ) + 1; } if ( $flg & 2 ) { $i = $i + 2; } } $decompressed = @gzinflate( substr( $gzData, $i, -8 ) ); if ( false !== $decompressed ) { return $decompressed; } } // Compressed data from java.util.zip.Deflater amongst others. $decompressed = @gzinflate( substr( $gzData, 2 ) ); if ( false !== $decompressed ) { return $decompressed; }
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Changelog Changelog
Version | Description |
---|---|
2.8.1 | Introduced. |