fork download 
  1. <?php
  2.  
  3. $text = " first  line... abc   
  4.  second  is  here... def   
  5.   <-- blank space here
  6.  fourth  line... hi  there   
  7.  
  8.  sith  is  here....   ";
  9.  
  10.  // get rid of spaces at the beginning and end of line
  11.  $regex = '~^\ +|\ +$~m';
  12.  $text = preg_replace($regex, '', $text);
  13.  
  14.  // get rid of more than two consecutive spaces
  15. $regex = '~\ {2,}~';
  16. $text = preg_replace($regex, ' ', $text);
  17. echo $text;
  18.  
  19. ?>
Success #stdin #stdout 0.01s 52488KB
comments (?)
stdin 
Standard input is empty
stdout 
first line... abc
second is here... def
<-- blank space here
fourth line... hi there

sith is here....
https://ideone.com/ERZUTt
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!