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  1. <?php
  2.  
  3. // your code goes here
  4. $ar = array('1','2','3','4');
  5.  
  6. array_walk(
  7.     $ar,
  8.     function (&$s, $k, $prefix = 'aaa') {
  9.         $s = str_pad($s, strlen($prefix) + strlen($s), $prefix, STR_PAD_LEFT);
  10.     }
  11. );
  12.  
  13. var_dump($ar);
  14.  
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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array(4) {
  [0]=>
  string(4) "aaa1"
  [1]=>
  string(4) "aaa2"
  [2]=>
  string(4) "aaa3"
  [3]=>
  string(4) "aaa4"
}
https://ideone.com/nI0IgC
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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