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<title>Errors in PHP 7</title>
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<h2 class="title">Errors in PHP 7</h2>
<p class="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 <a href="class.error.html" class="classname">Error</a> exceptions.
</p>
<p class="para">
As with normal exceptions, these <a href="class.error.html" class="classname">Error</a> exceptions
will bubble up until they reach the first matching
<a href="language.exceptions.html#language.exceptions.catch" class="link"><em>catch</em></a>
block. If there are no matching blocks, then any default exception handler
installed with <span class="function"><a href="function.set-exception-handler.html" class="function">set_exception_handler()</a></span> 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.
</p>
<p class="para">
As the <a href="class.error.html" class="classname">Error</a> hierarchy does not inherit from
<a href="class.exception.html" class="classname">Exception</a>, code that uses
<code class="code">catch (Exception $e) { ... }</code> blocks to handle uncaught
exceptions in PHP 5 will find that these <a href="class.error.html" class="classname">Error</a>s are
not caught by these blocks. Either a <code class="code">catch (Error $e) { ... }</code>
block or a <span class="function"><a href="function.set-exception-handler.html" class="function">set_exception_handler()</a></span> handler is required.
</p>
<div class="sect2" id="language.errors.php7.hierarchy">
<h3 class="title"><a href="class.error.html" class="classname">Error</a> hierarchy</h3>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.throwable.html" class="classname">Throwable</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.error.html" class="classname">Error</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.arithmeticerror.html" class="classname">ArithmeticError</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.divisionbyzeroerror.html" class="classname">DivisionByZeroError</a></span>
</li>
</ul>
</li>
<li class="listitem">
<span class="simpara"><a href="class.assertionerror.html" class="classname">AssertionError</a></span>
</li>
<li class="listitem">
<span class="simpara"><a href="class.compileerror.html" class="classname">CompileError</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.parseerror.html" class="classname">ParseError</a></span>
</li>
</ul>
</li>
<li class="listitem">
<span class="simpara"><a href="class.typeerror.html" class="classname">TypeError</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara"><a href="class.argumentcounterror.html" class="classname">ArgumentCountError</a></span>
</li>
</ul>
</li>
</ul>
</li>
<li class="listitem">
<span class="simpara"><a href="class.exception.html" class="classname">Exception</a></span>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara">...</span>
</li>
</ul>
</li>
</ul>
</li>
</ul>
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