Errata

The order of the parameters of the function were inversed.

array_search ($array, $value)

NOW READS:
array_search ($value, $array)

The order of the parameters were also inversed for in_array, first code line under Solution:

NOW READS:
if (in_array($value, $array)) {

Minute %M I
should be lowercase i

Note from the Author or Editor:
This was an error in 1ed, fixed in 2ed.

The return values, not the arguments, for asin(), acos(), and atan() are in radians. The arguments for these functions are dimensionless.

NOW READS:
"These functions assume that all angles are in radians, not degrees."

Inside the pc_debug() function in the first code block of the Solution, inside pc_debug() in the first code block of the
Discussion, inside pc_debug() and in the if()/elseif() statement in the last
code block of the Discussion:

"defined(DEBUG)"

NOW READS:

"defined('DEBUG')

ftruncate($fp,0)

NOW READS:
ftruncate($fh,0)

In the following code, the DBM handle was missing for dba_replace and dba_insert.
The code at the bottom of page 244 NOW READS:

$dbh = dba_open('fish.db','c','gdbm') or die($php_errormsg);

// retrieve and change values
if (dba_exists('flounder',$dbh)) {
$flounder_count = dba_fetch('flounder',$dbh);
$flounder_count++;
dba_replace('flounder',$flounder_count, $dbh);
print "Updated the flounder count.";
} else {
dba_insert('flounder',1, $dbh);
print "Started the flounder count.";
}

The DBM handle was also missing in the code at the top of page 245;
This code NOW READS:

// what fish do we have?
for ($key = dba_firstkey($dbh); $key !== false; $key = dba_nextkey($dbh)) {
$value = dba_fetch($key, $dbh); =>
print "$key: $value
";
}

The DBM handle was also missing in the code at the bottom of page 246;
This code NOW READS:

// read in and unserialize the data
if ($exists = dba_exists($_REQUEST['username'], $dbh)) {
$serialized_data = dba_fetch($_REQUEST['username'], $dbh) or die($php_errormsg);
$data = unserialize($serialized_data);
} else {
$data = array();
}

The DBM handle was also missing for dba_replace and dba_insert, in the code at the top of page 247.
This code NOW READS:

// write data back to file
if ($exists) {
dba_replace($_REQUEST['username'],serialize($data), $dbh);
} else {
dba_insert($_REQUEST['username'],serialize($data), $dbh);
}

printf('<tr><td>%s: </td><td><input type="text" name="%s" value="%s">,

NOW READS:
printf('<tr><td>%s: </td><td><input type="text" name="%s" value="%s">',

The link -

http://xmlrpc-epi.sourceforge.net/sample/utils/utils.php

NOW READS:
http://xmlrpc-epi.sourceforge.net/xmlrpc_php/index.php

The book describes a beta version of Net_Whois. Between the time we wrote
the chapter and Net_Whois 1.0, there were
some backwards incompatible changes made to the API. Net_Whois::query() is
no longer a static method

Previously the Solution was:

require 'Net/Whois.php';
$server = 'whois.networksolutions.com';
$query = 'example.org';
$data = Net_whois::query($server, $query);

The Solution NOW READS:

require 'Net/Whois.php';
$server = 'whois.networksolutions.com';
$query = 'example.org';

$whois = new Net_Whois;
$data = $whois->query($server, $query);

In discussion on page 452, the line
"print Net_Whois::query('whois.internic.net', 'example.org');"

NOW READS::
$whois = new Net_Whois;
print $whois->query('example.org', 'whois.internic.net');

NOW READS:
"passes it two arguments: 12; and 56."