PHP: Using variable inside an array that gets passed into a function

Question

Is it possible to do something similar to the following, I've tried but couldn't get any variations of this to work:

$hello_all = array($str . ' World', $str . ' Universe');

function combine(&$arr){
  $str = 'Hello';
  print_r($arr);
}

combine($hello_all);

And I'd like to get something like this:

Array ( [0] => Hello World [1] => Hello Universe )

Is there a better approach?

yes, but not that way - just the other way round. The concatanation would be IN a function. — Jeff
– Jeff, Commented Jun 22, 2017 at 0:53
What do you really want to achieve? I mean, 'Hello' won't be hard coded, will it? — Jeff
– Jeff, Commented Jun 22, 2017 at 0:55
No, not hard coded. It's another variable but I wanted to simplify the example down to the part that I was questioning. — krumholz
– krumholz, Commented Jun 22, 2017 at 1:05
You could of course do a kind of templating with preg_replace and things like array('#replace# World'), but that would be much slower than Patrick's solution — Jeff
– Jeff, Commented Jun 22, 2017 at 1:09

Patrick Simard · Accepted Answer · 2017-06-22 00:59:20Z

3

I would probably do it like this

$hello_all = array('World', 'Universe');

function combine($arr, $str){

  foreach($arr as $key=>$value){
    $new[] = $str.$value;
  }

  return $new;
}

$print = combine($hello_all, 'Hello ');
print_r($print);

?>

edited Jun 22, 2017 at 0:59

answered Jun 22, 2017 at 0:56

Patrick Simard

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6 Comments

Jeff Over a year ago

yes, but please put the print_r() outside of the function, and let the function just return the new array. Just for my eyes....

Jeff Over a year ago

...forgot the return

Patrick Simard Over a year ago

Yup I agree. I made the changes

Patrick Simard Over a year ago

Your right since the print_r is no longer in the function

krumholz Over a year ago

This makes sense. I think I simplified my example a bit too much. But the array would be closer to this: $hello_all = array('Hidey ho ' . $str . ' World', 'We come in peace ' . $str . ' Universe');

|

Patrick Simard · Accepted Answer · 2017-06-22 01:33:58Z

0

Yup something like this in that case:

$hello_all = array('World *word*', 'Universe *word*', '*word* mom', 'Hey santa! *word* to you!');

function combine($arr, $str, $find){

  foreach($arr as $key=>$value){
    $new[] = str_replace($find, $str, $value);
  }

  return $new;
}

$print = combine($hello_all, 'Hello', '*word*');
print_r($print);

?>

answered Jun 22, 2017 at 1:33

Patrick Simard

2,4003 gold badges26 silver badges41 bronze badges

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