sigmasternchen/php-doc-en
1
0
Fork 0
mirror of https://github.com/sigmasternchen/php-doc-en synced 2025-03-15 16:38:54 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Split out string stuff.

Browse source 
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@337356 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Adam Harvey 2015-08-09 01:16:15 +00:00
parent 9b0502b2dd
commit 8073d96d46
2 changed files with 103 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
appendices/migration70/incompatible.xml
View file

@ -7,6 +7,7 @@
&appendices.migration70.incompatible.variable-handling;
&appendices.migration70.incompatible.foreach;
&appendices.migration70.incompatible.integers;
&appendices.migration70.incompatible.strings;
&appendices.migration70.incompatible.removed-functions;
&appendices.migration70.incompatible.removed-ini-directives;
&appendices.migration70.incompatible.other;

102
appendices/migration70/incompatible/strings.xml Normal file
View file

@ -0,0 +1,102 @@
<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect2 xml:id="migration70.incompatible.strings">
<title>Changes to <type>string</type> handling</title>
<sect3 xml:id="migration70.incompatible.strings.hex">
<title>Hexadecimal strings are no longer considered numeric</title>
<para>
Strings containing hexadecimal numbers are no longer considered to be
numeric. For example:
</para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
var_dump("0x123" == "291");
var_dump(is_numeric("0x123"));
var_dump("0xe" + "0x1");
var_dump(substr("foo", "0x1"));
?>
]]>
</programlisting>
&example.outputs.5;
<screen>
<![CDATA[
bool(true)
bool(true)
int(15)
string(2) "oo"
]]>
</screen>
&example.outputs.7;
<screen>
<![CDATA[
bool(false)
bool(false)
int(0)
Notice: A non well formed numeric value encountered in /tmp/test.php on line 5
string(3) "foo"
]]>
</screen>
</informalexample>
<para>
<function>filter_var</function> can be used to check if a
<type>string</type> contains a hexadecimal number, and also to convert a
string of that type to an <type>integer</type>:
</para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
$str = "0xffff";
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
if (false === $int) {
throw new Exception("Invalid integer!");
}
var_dump($int); // int(65535)
?>
]]>
</programlisting>
</informalexample>
</sect3>
<sect3 xml:id="migration70.incompatible.strings.unicode-escapes">
<title><literal>\u{</literal> may cause errors</title>
<para>
Due to the addition of the new
<link linkend="migration70.new-features.unicode-codepoint-escape-syntax">Unicode codepoint escape syntax</link>,
strings containing a literal <literal>\u{</literal> followed by an invalid
sequence will cause a fatal error. To avoid this, the leading backslash
should be escaped.
</para>
</sect3>
</sect2>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->