language/control-structures/declare.xml
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28529d3539b850e870e3aa97570f4db0e53daa03
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<!-- $Revision$ -->
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<sect1 xml:id="control-structures.declare" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title><literal>declare</literal></title>
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<title>declare</title>
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<?phpdoc print-version-for="declare"?>
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<para>
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The <literal>declare</literal> construct is used to
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<link linkend="control-structures.declare.encoding">encoding</link>
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directive) and the <literal>strict_types</literal> directive (See for more
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information the
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<link linkend="functions.arguments.type-declaration.strict">strict</link>
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section on the Function arguments page)
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</para>
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>7.0.0</entry>
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<entry>Added <literal>strict_types</literal> directive</entry>
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</row>
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<row>
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<entry>7.0.0</entry>
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<entry>
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The <literal>ticks</literal> directive does no longer leak into different
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compilation units.
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</entry>
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</row>
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<row>
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<entry>5.3.0</entry>
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<entry>Added <literal>encoding</literal> directive</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<link linkend="language.types.declarations.strict">strict typing</link>
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section on the type declarations page)
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</para>
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<para>
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As directives are handled as the file is being compiled, only literals may
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be given as directive values. Variables and constants cannot be used. To
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echo "tick_handler() called\n";
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}
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register_tick_function('tick_handler');
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$a = 1;
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if ($a > 0) {
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$a += 2;
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print($a);
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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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<para>
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<example>
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<title>Ticks usage example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function tick_handler()
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{
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echo "tick_handler() called\n";
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}
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register_tick_function('tick_handler'); // causes a tick event
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$a = 1;
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tick_handler();
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$a = 1; // causes a tick event
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if ($a > 0) {
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$a += 2;
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tick_handler();
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print($a);
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tick_handler();
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$a += 2; // causes a tick event
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print $a; // causes a tick event
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}
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tick_handler();
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?>
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]]>
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</simpara>
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</caution>
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<para>
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The encoding declare value is ignored in PHP 5.3 unless php is compiled with
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<literal>--enable-zend-multibyte</literal>.
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</para>
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<para>
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Note that PHP does not expose whether <literal>--enable-zend-multibyte</literal> was
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used to compile PHP other than by <function>phpinfo</function>.
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</para>
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<para>
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See also <link linkend="ini.zend.script-encoding">zend.script_encoding</link>.
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</para>
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</sect2>
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