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  1. <?php
  2.  
  3. $str = "Ololo   lalala     test  lorem ipsum.";
  4.  
  5. function repl ( $str, $spaces = "", $down = FALSE) {
  6.   return $down ?
  7.     (strlen($spaces) > 0 ? repl (str_replace ( $spaces, "_", $str ), substr($spaces, 1), $down) : $str)
  8.   : (5<=(strlen($spaces)) ? repl($str, $spaces, TRUE) : repl($str, $spaces . ' '));
  9. }
  10.  
  11. echo(repl($str));
  12.  
  13. ?>
Success #stdin #stdout 0.01s 20568KB
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Ololo_lalala_test_lorem_ipsum.
https://ideone.com/1KaaRe
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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