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  1. <?php
  2.  
  3. 	$string = '99999999999999';
  4.  
  5. 	for($i=strlen($string); $i>0; $i-=4) $string=substr_replace($string, ' ', $i, 0);
  6.  
  7. 	echo $string;
Success #stdin #stdout 0s 82880KB
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stdin
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Standard input is empty
stdout
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99 9999 9999 9999
https://ideone.com/p1fg5K
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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