String 字符串

多行字符串：

http://php.net/manual/zh/language.types.string.php#language.types.string.syntax.nowdoc

DEMO：

　　//heredoc 解析变量

<?php

$str = <<<EOD
//some codes you want to write
//the end of the block should be a new line and have no space
EOD;

echo $str;

?>

<?php
/* newdoc */
$str = <<<'EOD'
Example of string
spanning multiple lines
using nowdoc syntax.
EOD;