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Document the changed array indexing, pending information from the dev

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team on what it's really supposed to be doing.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@133462 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Torben Wilson 2003-06-27 21:27:30 +00:00
parent 2f9280c037
commit 66da45a2bd
1 changed files with 29 additions and 14 deletions
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43
language/types.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.122 $ -->
<!-- $Revision: 1.123 $ -->
<chapter id="language.types">
<title>Types</title>
@ -1317,12 +1317,8 @@ echo $arr["somearray"]["a"]; // 42
<para>
If you do not specify a key for a given value, then the maximum
of the integer indices is taken, and the new key will be that
maximum value + 1--unless that maximum value is negative (is it
perfectly legal to have negative array indices). In this case,
the new key will be <literal>0</literal>. If no integer indices
exist yet, the key will be <literal>0</literal> (zero). If you
specify a key that already has a value assigned to it, that
value will be overwritten.
maximum value + 1. If you specify a key that already has a value
assigned to it, that value will be overwritten.
<informalexample>
<programlisting role="php">
<![CDATA[
@ -1337,6 +1333,16 @@ array(5 => 43, 6 => 32, 7 => 56, "b" => 12);
</programlisting>
</informalexample>
</para>
<warning>
<simpara>
As of PHP 4.3.0, the index generation behaviour described
above has changed. Now, if you append to an array in which
the current maximum key is negative, then the next key
created will be zero (<literal>0</literal>). Before, the new
index would have been set to the largest existing key + 1,
the same as positive indices are.
</simpara>
</warning>
<para>
Using &true; as a key will evaluate to <type>integer</type>
<literal>1</literal> as key. Using &false; as a key will evaluate
@ -1397,13 +1403,22 @@ unset($arr); // This deletes the whole array
<para>
As mentioned above, if you provide the brackets with no key
specified, then the maximum of the existing integer indices is
taken, and the new key will be that maximum value + 1--unless
that maximum value is negative (is it perfectly legal to have
negative array indices). In this case, the new key will be
<literal>0</literal>. If no integer indices exist yet, the key
will be <literal>0</literal> (zero). If you specify a key that
already has a value assigned to it, that value will be
overwritten.
taken, and the new key will be that maximum value + 1 . If no
integer indices exist yet, the key will be <literal>0</literal>
(zero). If you specify a key that already has a value assigned
to it, that value will be overwritten.
</para>
<para>
<warning>
<simpara>
As of PHP 4.3.0, the index generation behaviour described
above has changed. Now, if you append to an array in which
the current maximum key is negative, then the next key
created will be zero (<literal>0</literal>). Before, the new
index would have been set to the largest existing key + 1,
the same as positive indices are.
</simpara>
</warning>
</para>
<para>
Note that the maximum integer key used for this <emphasis>need