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  1. <?php
  2.  
  3. function maskIp($value) {
  4.     $len = strlen($value);
  5.     $j = 0;
  6.  
  7.     for ($i = $len - 1; $j < 4 && $i > -1; --$i) {
  8.         if (ctype_digit($value{$i})) {
  9.             ++$j;
  10.             $value{$i} = '*';
  11.         }
  12.     }
  13.  
  14.     return $value;
  15. }
  16.  
  17. echo maskIp('127.0.0.100'), PHP_EOL;
  18. echo maskIp('127.0.0.10'), PHP_EOL;
  19. echo maskIp('127.0.0.1'), PHP_EOL;
  20. echo maskIp('127.0.255.100'), PHP_EOL;
  21. echo maskIp('127.0.25.100'), PHP_EOL;
Success #stdin #stdout 0.01s 52488KB
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stdin
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Standard input is empty
stdout
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127.0.*.***
127.*.*.**
12*.*.*.*
127.0.25*.***
127.0.2*.***
https://ideone.com/EyyOxD
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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