What are the representation methods of php strings?

表示方法有：1、用单引号把字符包围起来，语法“'字符'”；2、用双引号把字符包围起来，语法“"字符"”；3、 heredoc语法结构，语法“572255f0f671d91e1cf7b24c0b47548a结构声明大段的不用解析的文本类似。

<?php
@header("Content-type: text/html; charset=utf-8"); 
 
$name = &#39;php&#39;;
function foo(){
	static $str = <<<&#39;EOS&#39;
$name
\n
\r
\t
\v
\e
\f
\
\\
\\\\\
\$name
\"
\&#39;
\x41
\072
EOS;
echo $str;
}
foo();
 
/* 含有变量的更复杂示例 */
class foo
{
    
	const cons= <<<&#39;EOD&#39;
cons
EOD;
	var $test= <<<&#39;EOD&#39;
"test"
EOD;
	var $bar;
    function foo()
    {
        $this->bar = array(&#39;Bar1&#39;, &#39;Bar2&#39;, &#39;Bar3&#39;);
    }
}
 
$foo = new foo();
echo foo::cons."\n";
echo <<<&#39;EOT&#39;
nowdoc中不支持复杂的格式如：
\$foo->test=> $foo->test.
{\$foo->bar[1]}=>{$foo->bar[1]}.
EOT;
?>

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