reference/reflection/reflectionparameter/iscallable.xml
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="reflectionparameter.iscallable" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>ReflectionParameter::isCallable</refname>
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<refpurpose>Returns whether parameter MUST be callable</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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&warn.deprecated.function-8-0-0;
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<para>See the example below for an alternative way to derive this information.</para>
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</refsynopsisdiv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<methodsynopsis role="ReflectionParameter">
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<modifier>public</modifier> <type>bool</type><methodname>ReflectionParameter::isCallable</methodname>
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<void />
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<void/>
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</methodsynopsis>
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<para>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>PHP 8.0.0 equivalent</title>
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<para>
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As of PHP 8.0.0, the following code will report if a type supports callables,
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including as part of a union.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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function declaresCallable(ReflectionParameter $reflectionParameter): bool
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{
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$reflectionType = $reflectionParameter->getType();
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</refentry>
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if (!$reflectionType) return false;
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$types = $reflectionType instanceof ReflectionUnionType
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? $reflectionType->getTypes()
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: [$reflectionType];
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return in_array('callable', array_map(fn(ReflectionNamedType $t) => $t->getName(), $types));
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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