php-doc-en/appendices/migration71/other-changes.xml

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect1 xml:id="migration71.other-changes" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Other changes</title>
<sect2 xml:id="migration71.other-changes.apprise-on-arithmetic-with-invalid-strings">
<title>Notices and warnings on arithmetic with invalid strings</title>
<para>
New <constant>E_WARNING</constant> and <constant>E_NOTICE</constant> errors
have been introduced when invalid strings are coerced using operators
expecting numbers (<literal>+</literal> <literal>-</literal>
<literal>*</literal> <literal>/</literal> <literal>**</literal>
<literal>%</literal> <literal>&lt;&lt;</literal> <literal>&gt;&gt;</literal>
<literal>|</literal> <literal>&amp;</literal> <literal>^</literal>) or their
assignment equivalents. An <constant>E_NOTICE</constant> is emitted when the
string begins with a numeric value but contains trailing non-numeric
characters, and an <constant>E_WARNING</constant> is emitted when the string
does not contain a numeric value.
</para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
'1b' + 'something';
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Notice: A non well formed numeric value encountered in %s on line %d
Warning: A non-numeric value encountered in %s on line %d
]]>
</screen>
</informalexample>
</sect2>
<sect2 xml:id="migration71.other-changes.warn-on-octal-overflow">
<title>Warn on octal escape sequence overflow</title>
<para>
Previously, 3-octet octal string escape sequences would overflow silently.
Now, they will still overflow, but <constant>E_WARNING</constant> will be
emitted.
</para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
var_dump("\500");
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Warning: Octal escape sequence overflow \500 is greater than \377 in %s on line %d
string(1) "@"
]]>
</screen>
</informalexample>
</sect2>
<sect2 xml:id="migration71.other-changes.inconsistency-fixes-to-this">
<title>Inconsistency fixes to <literal>$this</literal></title>
<para>
Whilst <literal>$this</literal> is considered a special variable in PHP, it
lacked proper checks to ensure it wasn't used as a variable name or
reassigned. This has now been rectified to ensure that
<literal>$this</literal> cannot be a user-defined variable, reassigned to a
different value, or be globalised.
</para>
</sect2>
<sect2 xml:id="migration71.other-changes.session-id-generation-without-hashing">
<title>Session ID generation without hashing</title>
<para>
Session IDs will no longer be hashed upon generation. With this change
brings about the removal of the following four ini settings:
</para>
<itemizedlist>
<listitem>
<simpara>
<parameter>session.entropy_file</parameter>
</simpara>
</listitem>
<listitem>
<simpara>
<parameter>session.entropy_length</parameter>
</simpara>
</listitem>
<listitem>
<simpara>
<parameter>session.hash_function</parameter>
</simpara>
</listitem>
<listitem>
<simpara>
<parameter>session.hash_bits_per_character</parameter>
</simpara>
</listitem>
</itemizedlist>
<para>
And the addition of the following two ini settings:
</para>
<itemizedlist>
<listitem>
<simpara>
<parameter>session.sid_length</parameter> - defines the length of the
session ID, defaulting to 32 characters for backwards compatibility)
</simpara>
</listitem>
<listitem>
<simpara>
<parameter>session.sid_bits_per_character</parameter> - defines the number
of bits to be stored per character (i.e. increases the range of characters
that can be used in the session ID), defaulting to 4 for backwards
compatibility
</simpara>
</listitem>
</itemizedlist>
</sect2>
<sect2 xml:id="migration71.other-changes.ini-file-handling">
<title>Changes to INI file handling</title>
<variablelist>
<varlistentry>
<term><parameter>precision</parameter></term>
<listitem>
<para>
If the value is set to -1, then the dtoa mode 0 is used. The default
value is still 14.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>serialize_precision</parameter></term>
<listitem>
<para>
If the value is set to -1, then the dtoa mode 0 is used. The value -1 is
now used by default.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>gd.jpeg_ignore_warning</parameter></term>
<listitem>
<para>
The default of this &php.ini; setting has been changed to 1, so by
default libjpeg warnings are ignored.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>opcache.enable_cli</parameter></term>
<listitem>
<para>
The default of this &php.ini; setting has been changed to 1
(enabled) in PHP 7.1.2, and back to 0 (disabled) in PHP 7.1.7.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2 xml:id="migration71.other-changes.session-id-csprng-gen">
<title>Session ID generation with a CSPRNG only</title>
<para>
Session IDs will now only be generated with a CSPRNG.
</para>
</sect2>
<sect2 xml:id="migration71.other-changes.typeerror-error-messages">
<title>More informative <classname>TypeError</classname> messages when &null; is allowed</title>
<para>
<classname>TypeError</classname> exceptions for arg_info type checks will
now provide more informative error messages. If the parameter type or return
type accepts &null; (by either having a default value of &null; or being a
nullable type), then the error message will now mention this with a message
of "must be ... or null" or "must ... or be null."
</para>
</sect2>
</sect1>
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