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echo is not a function; neither is print; print, however, BEHAVES like a function -- #33968

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@192876 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Sean Coates 2005-08-09 17:38:32 +00:00
parent 664127b478
commit 3c16b3eb40
1 changed files with 11 additions and 6 deletions
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17
reference/strings/functions/echo.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.15 $ -->
<!-- $Revision: 1.16 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
<refentry id="function.echo">
<refnamediv>
@ -18,9 +18,12 @@
</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.
language construct), so you are not required to use parentheses
with it. <function>echo</function> (unlike some other language
constructs) does not behave like a function, so it cannot
always be used in the context of a function. Additionally, if you want to
pass more than one parameter to <function>echo</function>, the parameters
must not be enclosed within parentheses.
</para>
<para>
<example>
@ -67,11 +70,13 @@ 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.
// Because echo does not behave like 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
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>
]]>