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  1. <?php
  2.  
  3. $str = "Ololo   lalala     test  lorem ipsum.";
  4.  
  5. function five($n){
  6. 	return $n >= 5;
  7. }
  8.  
  9. function repl ( $is_enough, $str, $spaces = "", $down = FALSE) {
  10.   return $down ?
  11.     (strlen($spaces) > 0 ? repl ($is_enough, str_replace ( $spaces, "_", $str ), substr($spaces, 1), $down) : $str)
  12.   : ($is_enough(strlen($spaces)) ? repl($is_enough, $str, $spaces, TRUE) : repl($is_enough, $str, $spaces . ' '));
  13. }
  14.  
  15. echo(repl(five, $str));
  16.  
  17. ?>
Success #stdin #stdout #stderr 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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Ololo_lalala_test_lorem_ipsum.
stderr
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PHP Notice:  Use of undefined constant five - assumed 'five' in /home/KBesDC/prog.php on line 15
https://ideone.com/Z3VzJz
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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