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

<?xml version="1.0" encoding="utf-8"?>
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<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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