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Mention deprecation of implicit nullable types in function docs #4008

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Nov 5, 2024
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Mention deprecation of implicit nullable types in function docs #4008

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7 changes: 4 additions & 3 deletions language/functions.xml
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Expand Up @@ -454,8 +454,9 @@ Making a bowl of raspberry natural yogurt.
dropping the default value, since it will never be used.
One exception to this rule are arguments of the form
<code>Type $param = null</code>, where the &null; default makes the type implicitly
nullable. This usage remains allowed, though it is recommended to use an
explicit <link linkend="language.types.declarations.nullable">nullable type</link> instead.
nullable. This usage is deprecated as of PHP 8.4.0, and an explicit
<link linkend="language.types.declarations.nullable">nullable type</link>
should be used instead.
<example>
<title>Declaring optional arguments after mandatory arguments</title>
<programlisting role="php">
Expand All @@ -464,7 +465,7 @@ Making a bowl of raspberry natural yogurt.
function foo($a = [], $b) {} // Default not used; deprecated as of PHP 8.0.0
function foo($a, $b) {} // Functionally equivalent, no deprecation notice

function bar(A $a = null, $b) {} // Still allowed; $a is required but nullable
function bar(A $a = null, $b) {} // Deprecated as of PHP 8.4.0; $a is required but nullable
function bar(?A $a, $b) {} // Recommended
?>
]]>
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