如何在单引号内使用单引号? [英] How do I use single quotes inside single quotes?

问题描述

任何人都可以解释如何使此代码正常工作吗?

Can anyone explain how to make this code work?

echo '<div id="panel1-under">Welcome <?php echo "$_SESSION['username']"; ?></div>';

我尝试删除单引号(echo '<div id="panel1-under">Welcome <?php echo "$_SESSION[username]"; ?></div>';)，但是它不起作用.

I've tried removing the single quotes (echo '<div id="panel1-under">Welcome <?php echo "$_SESSION[username]"; ?></div>';), but it doesn't work.

推荐答案

echo "<div id=\"panel1-under\">Welcome ".$_SESSION['username']."</div>";

或

echo '<div id="panel1-under">Welcome '.$_SESSION['username'].'</div>';

快速说明:

• 您不必在回显字符串("...")内重新打开标签
• 我在这里所做的是传递与 $ _ SESSION ['username'] 和" ( .运算符的作用)

• PHP甚至足够聪明，可以检测PHP字符串中的变量并对其进行求值:

• You don't have to reopen the tags inside a echo String (" ... ")
• What I have done here is to pass the string "Welcome " concatenated to $_SESSION['username'] and "" (what the . operator does)

• PHP is even smart enough to detect variables inside a PHP string and evaluate them :

$ variablename =安德鲁";

$variablename = "Andrew";

回显你好$ variablename，欢迎使用"；

echo "Hello $variablename, welcome ";

=>你好，安德鲁，欢迎

=> Hello Andrew, welcome

更多信息: PHP.net-回声

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