php - How to echo element of associative array in string?

I know It's a very basic question but I have to ask.

I have an associative array let's say it is:

 $couple = array('husband' => 'Brad', 'wife' => 'Angelina'); 

Now, I want to print husband name in a string. There are so many ways but i want to do this way but it gives html error

$string = "$couple[\'husband\'] : $couple[\'wife\'] is my wife.";

Please correct me if I'm using a wrong syntax for backslash.

Answer

Your syntax is correct.

But, still you can prefer single quotes versus double quotes.

Because, double quotes are a bit slower due to variable interpolation.

(variables within double quotes are parsed, not the case for single quotes.)

A more optimized and cleaned version of your code:

$string = $couple['husband'] .' : ' . $couple['wife'] .' is my wife.';