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Improve array doc for string offset access.

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@324661 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Yasuo Ohgaki 2012-03-31 09:22:45 +00:00
parent ee0afeeaed
commit 3e98008af4
2 changed files with 61 additions and 0 deletions
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6
appendices/migration54.xml
View file

@ -112,6 +112,12 @@
and <literal>'5 foobar'</literal> are considered non-numeric and produce a <constant>E_WARNING</constant>, but are converted
to 12 and 5 respectively, for backward compatibility reasons.
</simpara>
<simpara>
Note: Following code returns different result.
</simpara>
<simpara>
$str='abc';var_dump(isset($str['x'])); // false for PHP 5.4 or later, but true for 5.3 or less
</simpara>
</listitem>
<listitem>
<simpara>

55
language/types/array.xml
View file

@ -118,6 +118,61 @@ $array = [
</listitem>
</itemizedlist>
</para>
<para>
From PHP 5.4, string offset access made consistent. As a result, some return values may be
different from older version. As of PHP 5.4, string offset should be integer or integer like
string, otherwise it will be in a warning.
</para>
<example>
<title>String offset access example</title>
<programlisting role="php">
<![CDATA[
<?php
$str = 'abc';
var_dump($str['1']); // 5.4.0>=: "b", Older versions: "b"
var_dump(isset($str['1'])); // 5.4.0>=: true, Older versions: ture
var_dump($str['1.0']); // 5.4.0>=: "b" with E_WARNING, Older versions: "b"
var_dump(isset($str['1.0'])); // 5.4.0>=: false, Older versions: true
var_dump($str['x']); // 5.4.0>=: "a" with E_WARNING, Older versions: "a"
var_dump(isset($str['x'])); // 5.4.0>=: false, Older versions: true
var_dump($str['1x']); // 5.4.0>=: "b", Older versions: "b"
var_dump(isset($str['1x'])); // 5.4.0>=: true, Older versions: ture
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
[php-5.3]$ php-5.3 test.php
string(1) "b"
bool(true)
string(1) "b"
bool(true)
string(1) "a"
bool(true)
string(1) "b"
bool(true)
[php-5.4]$ php-5.4 test.php
string(1) "b"
bool(true)
Warning: Illegal string offset '1.0' in /tmp/t.php on line 7
string(1) "b"
bool(false)
Warning: Illegal string offset 'x' in /tmp/t.php on line 9
string(1) "a"
bool(false)
string(1) "b"
bool(false)
</screen>
</example>
<para>
If multiple elements in the array declaration use the same key, only the last one