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  1. <?php
  2.  
  3. $strs = array("aa","apple", "google", "abc12345", "asdddd"); 
  4. foreach ($strs as $s) {
  5. 	$result = preg_replace('~(^.{3}|(?!^)\G)\K.~', "*", $s);
  6. 	echo $result . PHP_EOL;
  7. }
Success #stdin #stdout 0.02s 52432KB
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stdin
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Standard input is empty
stdout
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aa
app**
goo***
abc*****
asd***
https://ideone.com/NC71cD
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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