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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.15 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
<refentry id="function.echo">
<refnamediv>
<refname>echo</refname>
<refpurpose>Output one or more strings</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>void</type><methodname>echo</methodname>
<methodparam><type>string</type><parameter>arg1</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>...</parameter></methodparam>
</methodsynopsis>
<simpara>
Outputs all parameters.
</simpara>
<para>
<function>echo</function> is not actually a function (it is a
language construct) so you are not required to use parentheses
with it. In fact, if you want to pass more than one parameter
to echo, you must not enclose the parameters within parentheses.
</para>
<para>
<example>
<title><function>echo</function> examples</title>
<programlisting role="php">
<![CDATA[
<?php
echo "Hello World";
echo "This spans
multiple lines. The newlines will be
output as well";
echo "This spans\nmultiple lines. The newlines will be\noutput as well.";
echo "Escaping characters is done \"Like this\".";
// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; // foo is foobar
// You can also use arrays
$bar = array("value" => "foo");
echo "this is {$bar['value']} !"; // this is foo !
// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo
// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n";
echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
// Because echo is not a function, following code is invalid.
($some_var) ? echo 'true' : echo 'false';
// However, the following examples will work:
($some_var) ? print('true'): print('false'); // print is a function
echo $some_var ? 'true': 'false'; // changing the statement around
?>
]]>
</programlisting>
</example>
</para>
<para>
<function>echo</function> also has a shortcut syntax, where you can
immediately follow the opening tag with an equals sign. This short syntax
only works with the <link
linkend="ini.short-open-tag">short_open_tag</link> configuration setting
enabled.
<informalexample>
<programlisting role="php">
<![CDATA[
I have <?=$foo?> foo.
]]>
</programlisting>
</informalexample>
</para>
<simpara>
For a short discussion about the differences between
<function>print</function> and <function>echo</function>, see this FAQTs
Knowledge Base Article: <ulink url="&url.echo-print;">&url.echo-print;
</ulink>
</simpara>
¬e.language-construct;
<simpara>
See also
<function>print</function>,
<function>printf</function>, and
<function>flush</function>.
</simpara>
</refsect1>
</refentry>
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