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Function trailing commas #241

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Function trailing commas #241

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5f4f6a6
Note trailing comma in function definitions.
Crell Nov 25, 2020
85fa2f9
Mention trailing commas on use statements.
Crell Nov 25, 2020
90571f1
Reword comment.
Crell Nov 28, 2020
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32 changes: 30 additions & 2 deletions language/functions.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -200,7 +200,31 @@ function takes_array($input)
]]>
</programlisting>
</example>
</para>
</para>
<para>
As of PHP 8.0.0, the list of function arguments may include a trailing comma, which
will be ignored. That is particularly useful in cases where the list of arguments is
long or contains long variable names, making it convenient to list arguments vertically.
</para>
<example>
<title>Passing arrays to functions</title>
<programlisting role="php">
<![CDATA[
<?php
function takes_many_args(
$first_arg,
$second_arg,
$a_very_long_argument_name,
$arg_with_default = 5,
$again = 'a default string', // This trailing comma was not permitted before 8.0.0.
)
{
// ...
}
?>
]]>
</programlisting>
</example>
<sect2 xml:id="functions.arguments.by-reference">
<title>Passing arguments by reference</title>

Expand Down Expand Up @@ -885,7 +909,7 @@ $greet('PHP');
<simpara>
Closures may also inherit variables from the parent scope. Any such
variables must be passed to the <literal>use</literal> language construct.
From PHP 7.1, these variables must not include &link.superglobals;,
As of PHP 7.1, these variables must not include &link.superglobals;,
<varname>$this</varname>, or variables with the same name as a parameter.
</simpara>

Expand Down Expand Up @@ -949,6 +973,10 @@ string(11) "hello world"
</screen>
</example>

<para>
As of PHP 8.0.0, the list of scope-inherited variables may include a trailing
comma, which will be ignored.
</para>
<simpara>
Inheriting variables from the parent scope is <emphasis>not</emphasis>
the same as using global variables.
Expand Down