appendices/migration74/new-features.xml
e150cc645a17588282e5e6b5e43e600a2f345549
e150cc645a17588282e5e6b5e43e600a2f345549
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@@ -77,6 +77,33 @@ class ChildProducer extends Producer {
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Full variance support is only available if autoloading is used. Inside a
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single file only non-cyclic type references are possible, because all
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classes need to be available before they are referenced.
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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/**
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* These classes satisfy the LSP requirements, because C is a subtype of A.
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* However, at the time class B is declared, class C is not yet available
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*/
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class A
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{
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public function method(): A {}
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}
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class B extends A
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{
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// Fatal error: Could not check compatibility between B::method():C and
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// A::method(): A, because class С is not available
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public function method(): С {}
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}
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class C extends B {}
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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</sect3>
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@@ -142,7 +169,7 @@ $fruits = ['banana', 'orange', ...$parts, 'watermelon'];
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<title>Weak references</title>
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<para>
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Weak references allow the programmer to retain a reference to an object
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<link linkend="class.weakreference">Weak references</link> allow the programmer to retain a reference to an object
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that does not prevent the object from being destroyed.
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</para>
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</sect3>
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@@ -233,7 +260,7 @@ $fruits = ['banana', 'orange', ...$parts, 'watermelon'];
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The <function>preg_replace_callback</function> and <function>preg_replace_callback_array</function>
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functions now accept an additional <parameter>flags</parameter> argument, with support for the
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<constant>PREG_OFFSET_CAPTURE</constant> and <constant>PREG_UNMATCHED_AS_NULL</constant> flags.
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This influences the format of the matches array passed to to the callback function.
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This influences the format of the matches array passed to the callback function.
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</para>
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</sect2>
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@@ -314,10 +341,14 @@ $fruits = ['banana', 'orange', ...$parts, 'watermelon'];
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<![CDATA[
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<?php
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// Returns array containing all the necessary state of the object.
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public function __serialize(): array;
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public function __serialize(): array
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{
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}
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// Restores the object state from the given data array.
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public function __unserialize(array $data): void;
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public function __unserialize(array $data): void
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{
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}
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?>
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]]>
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</programlisting>
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