实例
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<h3>php字符串变量解析-单引号</h3>
<?php
$danName='单引号';
echo ' "\\这是\''.$danName.'\'的变量解析" ';
?>
<h3>php字符串变量解析-双引号</h3>
<?php
$danName="双引号";
echo "\"\\这是'{$danName}'的变量解析\""
?>
<h3>herdoc语法</h3>
<?php
$danName="herdoc";
echo <<<HEREDOC
{$danName} \t \r \n
等价于使用了双引号的字符串，可以解析内部的变量和转义特殊字符
<b>$danName</b>
HEREDOC;
?>
<h3>nowdoc语法</h3>
<?php
$danName="herdoc";
echo <<<'NOWDOC'
{$danName} .$danName. '$danName' \t \r \n <br>
<b>nowdoc语法</b>相当于用单引号包装的字符串,可以用来包装html代码<br>
<b>不能解析内部的变量和转义特殊字符</b>
NOWDOC;
?>
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