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<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="function.get-error-handler" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>get_error_handler</refname>
<refpurpose>Gets the user-defined error handler function</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>callable</type><type>null</type></type><methodname>get_error_handler</methodname>
<void/>
</methodsynopsis>
<simpara>
Returns the current error handler function, if any.
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<simpara>
Returns the currently defined error handler (if any).
If the built-in error handler is used &null; is returned.
</simpara>
<simpara>
The returned handler is the exact callable value that was passed to
<function>set_error_handler</function> to define it.
</simpara>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>get_error_handler</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$handler = function (int $errno, string $errstr, ?string $errfile, ?int $errline) {
echo "Error: " . $errstr . "\n";
};
var_dump(get_error_handler()); // NULL
set_error_handler($handler);
var_dump(get_error_handler() === $handler); // bool(true)
?>
]]>
</programlisting>
</example>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<tip>
<simpara>
Prior to PHP 8.5.0, this functionality can be provided by the following
polyfill:
</simpara>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
if (!function_exists('get_error_handler')) {
function noop_error_handler() {
}
function get_error_handler(): ?callable {
$handler = set_error_handler('noop_error_handler');
restore_error_handler();
return $handler;
}
}
?>
]]>
</programlisting>
</informalexample>
</tip>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>error_reporting</function></member>
<member><function>set_error_handler</function></member>
<member><function>restore_error_handler</function></member>
<member><function>trigger_error</function></member>
<member><link linkend="errorfunc.constants">error level constants</link></member>
</simplelist>
</refsect1>
</refentry>
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