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</div><hr /><div id="migration71.other-changes" class="sect1">
<h2 class="title">Other changes</h2>
<div class="sect2" id="migration71.other-changes.apprise-on-arithmetic-with-invalid-strings">
<h3 class="title">Notices and warnings on arithmetic with invalid strings</h3>
<p class="para">
New <strong><code>E_WARNING</code></strong> and <strong><code>E_NOTICE</code></strong> errors
have been introduced when invalid strings are coerced using operators
expecting numbers (<em>+</em> <em>-</em>
<em>*</em> <em>/</em> <em>**</em>
<em>%</em> <em><<</em> <em>>></em>
<em>|</em> <em>&</em> <em>^</em>) or their
assignment equivalents. An <strong><code>E_NOTICE</code></strong> is emitted when the
string begins with a numeric value but contains trailing non-numeric
characters, and an <strong><code>E_WARNING</code></strong> is emitted when the string
does not contain a numeric value.
</p>
<div class="informalexample">
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #DD0000">'1b' </span><span style="color: #007700">+ </span><span style="color: #DD0000">'something'</span><span style="color: #007700">;</span>
</span>
</code></div>
</div>
<p class="para">The above example will output:</p>
<div class="example-contents screen">
<div class="cdata"><pre>
Notice: A non well formed numeric value encountered in %s on line %d
Warning: A non-numeric value encountered in %s on line %d
</pre></div>
</div>
</div>
</div>
<div class="sect2" id="migration71.other-changes.warn-on-octal-overflow">
<h3 class="title">Warn on octal escape sequence overflow</h3>
<p class="para">
Previously, 3-octet octal string escape sequences would overflow silently.
Now, they will still overflow, but <strong><code>E_WARNING</code></strong> will be
emitted.
</p>
<div class="informalexample">
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #DD0000">"\500"</span><span style="color: #007700">);</span>
</span>
</code></div>
</div>
<p class="para">The above example will output:</p>
<div class="example-contents screen">
<div class="cdata"><pre>
Warning: Octal escape sequence overflow \500 is greater than \377 in %s on line %d
string(1) "@"
</pre></div>
</div>
</div>
</div>
<div class="sect2" id="migration71.other-changes.inconsistency-fixes-to-this">
<h3 class="title">Inconsistency fixes to <em>$this</em></h3>
<p class="para">
Whilst <em>$this</em> 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
<em>$this</em> cannot be a user-defined variable, reassigned to a
different value, or be globalised.
</p>
</div>
<div class="sect2" id="migration71.other-changes.session-id-generation-without-hashing">
<h3 class="title">Session ID generation without hashing</h3>
<p class="para">
Session IDs will no longer be hashed upon generation. With this change
brings about the removal of the following four ini settings:
</p>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara">
<code class="parameter">session.entropy_file</code>
</span>
</li>
<li class="listitem">
<span class="simpara">
<code class="parameter">session.entropy_length</code>
</span>
</li>
<li class="listitem">
<span class="simpara">
<code class="parameter">session.hash_function</code>
</span>
</li>
<li class="listitem">
<span class="simpara">
<code class="parameter">session.hash_bits_per_character</code>
</span>
</li>
</ul>
<p class="para">
And the addition of the following two ini settings:
</p>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara">
<code class="parameter">session.sid_length</code> - defines the length of the
session ID, defaulting to 32 characters for backwards compatibility)
</span>
</li>
<li class="listitem">
<span class="simpara">
<code class="parameter">session.sid_bits_per_character</code> - 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
</span>
</li>
</ul>
</div>
<div class="sect2" id="migration71.other-changes.ini-file-handling">
<h3 class="title">Changes to INI file handling</h3>
<dl>
<dt>
<code class="parameter">precision</code></dt>
<dd>
<p class="para">
If the value is set to -1, then the dtoa mode 0 is used. The default
value is still 14.
</p>
</dd>
<dt>
<code class="parameter">serialize_precision</code></dt>
<dd>
<p class="para">
If the value is set to -1, then the dtoa mode 0 is used. The value -1 is
now used by default.
</p>
</dd>
<dt>
<code class="parameter">gd.jpeg_ignore_warning</code></dt>
<dd>
<p class="para">
The default of this <var class="filename">php.ini</var> setting has been changed to 1, so by
default libjpeg warnings are ignored.
</p>
</dd>
<dt>
<code class="parameter">opcache.enable_cli</code></dt>
<dd>
<p class="para">
The default of this <var class="filename">php.ini</var> setting has been changed to 1
(enabled) in PHP 7.1.2.
</p>
</dd>
</dl>
</div>
<div class="sect2" id="migration71.other-changes.session-id-csprng-gen">
<h3 class="title">Session ID generation with a CSPRNG only</h3>
<p class="para">
Session IDs will now only be generated with a CSPRNG.
</p>
</div>
<div class="sect2" id="migration71.other-changes.typeerror-error-messages">
<h3 class="title">More informative <a href="class.typeerror.html" class="classname">TypeError</a> messages when <strong><code>NULL</code></strong> is allowed</h3>
<p class="para">
<a href="class.typeerror.html" class="classname">TypeError</a> exceptions for arg_info type checks will
now provide more informative error messages. If the parameter type or return
type accepts <strong><code>NULL</code></strong> (by either having a default value of <strong><code>NULL</code></strong> 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."
</p>
</div>
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