PHP Can you update var inside a string?

Question

If you

$a = 'World'

$str = 'Hello '.$a

$a = ' John Doe'

Is there a way in PHP that $strwill now get the changed value from $a? I know that I get: $str = 'Hello World'what I would like:$str = 'Hello John Doe'

I know this can be done by replacing the old value with str_replace, but I would like to ask if there is a way to pass this var by reference or something like that.

Answer 1

In short, as soon as you set the line, its set. This is not related to arguments for anything like that.

People tend to use formatted strings for things like this:

 $formattedString = "Hello %s".PHP_EOL;
 $possibleValues = [ "World", "John Doe" ];

 foreach ($possibleValues as $value) {
      printf($formattedString, $value);
 }

Print

Hello world

Hi john doe

See how it works: http://sandbox.onlinephpfunctions.com/code/a9e8e7c71058b1e9a9212fbb398f9c40d20881b5

Answer 2

$a

$a = 'World';
$ra = &$a;
$str = 'Hello '.$ra;
$a = ' John Doe';