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https://github.com/sigmasternchen/php-doc-en
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c81b785e1b
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@90028 c90b9560-bf6c-de11-be94-00142212c4b1
119 lines
3.5 KiB
XML
119 lines
3.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
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<refentry id="function.echo">
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<refnamediv>
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<refname>echo</refname>
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<refpurpose>Output one or more strings</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<methodname>echo</methodname>
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<methodparam><type>string</type><parameter>arg1</parameter></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>argn...</parameter></methodparam>
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</methodsynopsis>
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<simpara>
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Outputs all parameters.
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</simpara>
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<para>
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<function>echo</function> is not actually a function (it is a
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language construct) so you are not required to use parentheses
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with it. In fact, if you want to pass more than one parameter
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to echo, you must not enclose the parameters within parentheses.
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It is not possible to use <function>echo</function> in a
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<link linkend="functions.variable-functions">variable function</link>
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context, but you can use <function>print</function> instead.
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<example>
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<title><function>echo</function> examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "Hello World";
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echo "This spans
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multiple lines. The newlines will be
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output as well";
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echo "This spans\nmultiple lines. The newlines will be\noutput as well.";
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echo "Escaping characters is done \"Like this\".";
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//You can use variables inside of an echo statement
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$foo = "foobar";
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$bar = "barbaz";
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echo "foo is $foo"; // foo is foobar
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// Using single quotes will print the variable name, not the value
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echo 'foo is $foo'; // foo is $foo
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// If you are not using any other characters, you can just echo variables
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echo $foo; // foobar
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echo $foo,$bar; // foobarbarbaz
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echo <<<END
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This uses the "here document" syntax to output
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multiple lines with $variable interpolation. Note
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that the here document terminator must appear on a
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line with just a semicolon no extra whitespace!
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END;
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// Because echo is not a function, following code is invalid.
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($some_var) ? echo('true'): echo('false');
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// However, the following examples will work:
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($some_var) ? print('true'): print('false'); // print is a function
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echo $some_var ? 'true': 'false'; // changing the statement around
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<function>echo</function> also has a shortcut syntax, where you
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can immediately follow the opening tag with an equals sign.
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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I have <?=$foo?> foo.
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]]>
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</programlisting>
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</informalexample>
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</para>
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<note>
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<para>
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This short syntax only works with the
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<link linkend="ini.short-open-tag">short_open_tag</link> configuration
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setting enabled.
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</para>
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</note>
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<simpara>
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See also
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<function>print</function>,
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<function>printf</function>, and
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<function>flush</function>.
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</simpara>
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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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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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