appendices/migration70/new-features.xml
1422d543bf028003a543fd1ce920c6a301a93a51
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<para>
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Scalar
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<link linkend="functions.arguments.type-declaration">type declarations</link>
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<link linkend="language.types.declarations">type declarations</link>
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come in two flavours: coercive (default) and strict. The following types
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for parameters can now be enforced (either coercively or strictly): strings
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(<type>string</type>), integers (<literal>int</literal>), floating-point
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top of the file. This means that the strictness of typing for scalars is
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configured on a per-file basis. This directive not only affects the type
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declarations of parameters, but also a function's return type (see
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<link linkend="functions.returning-values.type-declaration">return type declarations</link>,
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<link linkend="language.types.declarations">return type declarations</link>,
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built-in PHP functions, and functions from loaded
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extensions.
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</para>
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<para>
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Full documentation and examples of scalar type declarations can be found in
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the
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<link linkend="functions.arguments.type-declaration">type declaration</link>
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<link linkend="language.types.declarations">type declaration</link>
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reference.
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</para>
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</sect2>
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<para>
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PHP 7 adds support for
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<link linkend="functions.returning-values.type-declaration">return type declarations</link>.
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<link linkend="language.types.declarations">return type declarations</link>.
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Similarly to
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<link linkend="functions.arguments.type-declaration">argument type declarations</link>,
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<link linkend="language.types.declarations">argument type declarations</link>,
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return type declarations specify the type of the value that will be
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returned from a function. The same
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<link linkend="functions.arguments.type-declaration.types">types</link>
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<link linkend="language.types.declarations">types</link>
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are available for return type declarations as are available for argument
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type declarations.
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</para>
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<para>
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Full documentation and examples of return type declarations can be found in
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the
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<link linkend="functions.returning-values.type-declaration">return type declarations</link>.
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<link linkend="language.types.declarations">return type declarations</link>.
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reference.
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</para>
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</sect2>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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echo "\u{aa}";
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echo "\u{0000aa}";
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echo "\u{9999}";
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<?php
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echo "\u{aa}", PHP_EOL;
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echo "\u{0000aa}", PHP_EOL;
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echo "\u{9999}", PHP_EOL;
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echo <<<EOT
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\u{01f418}
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EOT;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<title>Expectations</title>
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<para>
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<link linkend="function.assert.expectations">Expectations</link> are a
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Expectations are a
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backwards compatible enhancement to the older <function>assert</function>
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function. They allow for zero-cost assertions in production code, and
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provide the ability to throw custom exceptions when the assertion fails.
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While the old API continues to be maintained for compatibility,
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<function>assert</function> is now a language construct, allowing the first
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parameter to be an expression rather than just a <type>string</type> to be
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evaluated or a <type>boolean</type> value to be tested.
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evaluated or a <type>bool</type> value to be tested.
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</para>
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<informalexample>
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<para>
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Full details on this feature, including how to configure it in both
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development and production environments, can be found in the
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<link linkend="function.assert.expectations">expectations section</link>
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of the <function>assert</function> reference.
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development and production environments, can be found on the manual page
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of the <function>assert</function> language construct.
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</para>
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</sect2>
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</sect2>
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<sect2 xml:id="migration70.new-features.csprng-functions">
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<title><link linkend="book.csprng">CSPRNG</link> Functions</title>
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<title>CSPRNG Functions</title>
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<para>
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Two new functions have been added to generate cryptographically secure
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Translation status