Version 4.2.0
22-Apr-2002 
ATTENTION!! register_globals defaults to 'off' now !!! 
Note: Apache2 support is EXPERIMENTAL. 

Moved ext/mailparse to PECL. See www.thebrainroom.com/opensource/php/ for more information and to download the extension. (Wez/Jim) 

Major modifications to the Sockets Extension and its API (Jason): 
Fixed numerous bugs. 
Added automatic host lookup capability to all functions that take addr's. example: socket_connect($sock, 'www.yahoo.com', 80); 
Corrected and standardized host lookup errors 
Modified socket_recv() behavior. [$r=socket_recv($sock, $buf, $len, $flags)] 
Added socket_set_block() which changes a socket into blocking IO mode 
Modified socket_last_error() to not clear the last error 
Added socket_clear_error() which clears the last error on a socket 
Removed all code pertaining to fd_sets (socket_fd_*) 
Modified/Improved socket_select() to accept array of resources instead of fd_sets. example: 
<?php
$wfds=$rfds=array($sock1, $sock2, $sock3, $sock7);
$r=socket_select($rfds, $wfds, NULL, 1);
print "Ready to read:\n"; var_dump($rfds);
?>

Changed read_exif_data() to be an alias of exif_read_data(). (Marcus) 
Added exif_tagname() function which returns the names of tags and exif_thumbnail() function to extract embedded thumbnails. (Marcus) 

Cleaned up the posix extension: (Markus) 
Removed unwanted warning messages 
Added posix_errno() and posix_strerror() for fetching error messages 
Changed the way posix_getgrnam() and posix_getgrgid() return their values (breaks BC but makes more sense) 

Added TIFF support for getimagesize() and read_exif_data(). (Marcus) 

Added safe_mode checks for opendir(). (jflemer) 

Changed the 2nd parameter in pgsql_fetch_*() functions to support NULL if all 3 parameters are supplied, but you do not want to provide a row number. (Derick) 

Added PHP_SAPI constant which contains the name of running SAPI. (Edin) 

Changed php.ini directive 'safe_mode_include_dir' to accept a (semi)colon separated path (like 'include_path') rather than a single directory. (jflemer) 

Added optional parameter to highlight_string() and highlight_file() which makes these functions to return a highlighted string instead of dumping it to standard output. (Derick) 

Added EXTR_IF_EXISTS and EXTR_PREFIX_IF_EXISTS flags to extract(). (Rasmus) 

Added function domxml_dump_node($doc,$node). Dumps a node plus all children into a string. (chregu) 
Added function domxml_node_get_content(). (chregu) 
Added function domxml_dump_file($filename,[$compression]). Dumps XML to a file and uses compression, if specified. (chregu) 
Added exslt integration to domxml extension (www.exslt.org/ for details). Configure with --with-dom-exslt[=DIR] (and --with-dom-xslt). (chregu,jaroslaw) 

Added optional second parameter to count() which can be used to specify either normal or recursive counting. (patch by Vlad Bosinceanu <glipy@fx.ro>) 

Added md5_file() function which calculates the MD5 sum of a file. Patch by Alessandro Astarita <aleast@capri.it> (Derick) 

Renamed key_exists() to array_key_exists(). (Derick) 

Added array_chunk() function which splits an array into chunks of specified size. (Andrei) 

Added session_cache_expire() function. (patch by <anuradha@gnu.org>) (Andrei) 

Added array_fill() function. (Rasmus) 

<?php
$carta_pro_jaspion = print_r(array_fill("morra, jaspion!",0,1000);
?>

Changed rand() and mt_rand() to be seed automatically if srand() or mt_srand() has not been called. (Sterling) 
Changed the seed options to srand() and mt_srand() to be optional. If the seed is not specified the most random seed possible is generated. (Sterling) 

Added array_change_key_case() function which returns an array with all string keys lowercased or uppercased. (Edin) 

Added support for 'int', 'bool', 'float' and 'null' in settype(). (Jeroen) 

Changed in_array() and search_array() to allow the needle to be an array in itself. (Andrei)