Semantic portal
Syntax: Heredoc syntax
<?php
$str = <<<EOD
Example of string
spanning multiple lines
using heredoc syntax.
EOD;
/* More complex example, with variables. */
class foo
{
var $foo;
var $bar;
function __construct()
{
$this->foo = 'Foo';
$this->bar = array('Bar1', 'Bar2', 'Bar3');
}
}
$foo = new foo();
$name = 'MyName';
echo <<<EOT
My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should print a capital 'A': \x41
EOT;
?><?php
// Static variables
function foo()
{
static $bar = <<<LABEL
Nothing in here...
LABEL;
}
// Class properties/constants
class foo
{
const BAR = <<<FOOBAR
Constant example
FOOBAR;
public $baz = <<<FOOBAR
Property example
FOOBAR;
}
?>- A third way to delimit strings is the heredoc syntax: <<<. After this operator, an identifier is provided, then a newline. The string itself follows, and then the same identifier again to close the quotation.
- The closing identifier must begin in the first column of the line.
- Heredoc text behaves just like a double-quoted string, without the double quotes.
- Quotes in a heredoc do not need to be escaped.
- Variables are expanded, but the same care must be taken when expressing complex variables inside a heredoc as with strings.
Identifier must follow the same naming rules as any other label in PHP: it must contain only alphanumeric characters and underscores, and must start with a non-digit character or underscore.