Question

Is there a way to dynamically change a variable value inside a string?

What i have tryed :

$World= "World";
$world = &$World;
$tmp = "Hello ".$world." ====";

$World= "Tada!";

echo $tmp;

What it echoed : Hello World ====
what i want it to echo : Hello Tada! ====

Answer 1

Is there a way to dynamically change a variable value inside of a string?

No.

There is no more “variable inside of a string” after this line got executed, but just a regular string.

you may use some placeholder instead of interpolating a variable

$tmp   = "Hello %s ====";
$World = "World";
echo sprintf($tmp,$World);
$World = "Tada!";
echo sprintf($tmp,$World);