Use php ifelse statement as $variable - php

Question

For example if statement
if($number == 1){
echo '$number == 1';
}
Such statement need to call multiple times. And possibly latter the statement need to change.
Can place this code in external file and the use include.
But better would be create variable something like
$variable = if($number == 1){
echo '$number == 1';
}
This does not work. Tried with ( ), " ". No success.
Any ideas? Is it possible at all?
Updated question
Writing one more time for those who write that question is not understandable.
So need this code if($number == 1){ echo '$number == 1'; } (actually code is much longer) to repeat some 30 times.
And time after time some part of code manually would need to change.
One way how can I do it is to place the code in external file, for example external_file.php and then use require($_SERVER['DOCUMENT_ROOT'] . "/external_file.php");.
Instead of including external content would want to define/create (now I see that need function).
Hope now is clear what I want.
Thanks for answers, will experiment.

Answer 1

Please use functions for reusability
function reuseFun($num){
if($num == 1){
return 'Number = 1';
}
else{
return 'Number != 1';
}
}
echo reuseFun(1);

Answer 2

Maybe like this?
function checkNumber($number) {
if($number == 1){
return true;
}
}
And then you can use it like this:
if (checkNumber(1)) {
echo 'something';
}

Answer 3

Use function :
function myTest($number) {
if($number == 1){
echo '$number == 1';
}
}

Answer 4

That won't work, but you could try this:
if($number == 1) {
$variable = 'number is 1';
} elseif($number == 2) {
$variable = 'number is 2';
}
echo $variable;

Answer 5

It is not clear what you need with the if statement, however if you need shorthand form of if use following code.
echo 'text '. ($number == 1 ? '$number == 1' : 'something else'). ' text';
more examples
if you need to reuse the code just put this code inside the function as follows,
function print_number($number){
echo 'text '. ($number == 1 ? '$number == 1' : 'something else'). ' text';
}