fork(2) download 
  1. <?php
  2. $s = ""; $re = "";
  3. for ($i = 0; $i < 100; $i++)
  4. {
  5. 	$s .=  substr((string)$i, strlen((string)$i)-1, 1);
  6. 	$re .= "(\\d)";
  7. }//echo $s . PHP_EOL;//echo $re. PHP_EOL;
  8. preg_match("/" . $re . "/", $s, $m);
  9. echo $m[100] . PHP_EOL;
  10. echo preg_replace("/" . $re . "/", '${100}', $s);
Success #stdin #stdout 0.02s 52432KB
comments (?)
stdin 
Standard input is empty
stdout 
9
${100}
https://ideone.com/RZXbGu
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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