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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect1 xml:id="language.errors.php7" xmlns="http://docbook.org/ns/docbook">
<title>Errors in PHP 7</title>
<para>
PHP 7 changes how most errors are reported by PHP. Instead of reporting
errors through the traditional error reporting mechanism used by PHP 5, most
errors are now reported by throwing <classname>Error</classname> exceptions.
</para>
<para>
As with normal exceptions, these <classname>Error</classname> exceptions
will bubble up until they reach the first matching
<link linkend="language.exceptions.catch"><literal>catch</literal></link>
block. If there are no matching blocks, then any default exception handler
installed with <function>set_exception_handler</function> will be called,
and if there is no default exception handler, then the exception will be
converted to a fatal error and will be handled like a traditional error.
</para>
<para>
As the <classname>Error</classname> hierarchy does not inherit from
<classname>Exception</classname>, code that uses
<code>catch (Exception $e) { ... }</code> blocks to handle uncaught
exceptions in PHP 5 will find that these <classname>Error</classname>s are
not caught by these blocks. Either a <code>catch (Error $e) { ... }</code>
block or a <function>set_exception_handler</function> handler is required.
</para>
<sect2 xml:id="language.errors.php7.hierarchy">
<title><classname>Error</classname> hierarchy</title>
<itemizedlist>
<listitem>
<simpara><classname>Throwable</classname></simpara>
<itemizedlist>
<listitem>
<simpara><classname>Error</classname></simpara>
<itemizedlist>
<listitem>
<simpara><classname>ArithmeticError</classname></simpara>
<itemizedlist>
<listitem>
<simpara><classname>DivisionByZeroError</classname></simpara>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<simpara><classname>AssertionError</classname></simpara>
</listitem>
<listitem>
<simpara><classname>CompileError</classname></simpara>
<itemizedlist>
<listitem>
<simpara><classname>ParseError</classname></simpara>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<simpara><classname>TypeError</classname></simpara>
<itemizedlist>
<listitem>
<simpara><classname>ArgumentCountError</classname></simpara>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<simpara><classname>ValueError</classname></simpara>
</listitem>
<listitem>
<simpara><classname>UnhandledMatchError</classname></simpara>
</listitem>
<listitem>
<simpara><classname>FiberError</classname></simpara>
</listitem>
<listitem>
<simpara><classname>RequestParseBodyException</classname></simpara>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<simpara><classname>Exception</classname></simpara>
<itemizedlist>
<listitem>
<simpara>...</simpara>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</sect2>
</sect1>
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-->
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