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  1. <?php
  2.  
  3. $string = "test is the {COMMAND line -STRET (interface 5more 9words #here";
  4. $strlowercase = strtolower($string);
  5.  
  6. $result = preg_replace_callback('~(^|[^a-zA-Z])([a-z])~', function($matches)
  7. {
  8.     return $matches[1] . ucfirst($matches[2]);
  9. }, $strlowercase);
  10.  
  11. var_dump($result);
Success #stdin #stdout 0.01s 82944KB
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Standard input is empty
stdout
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string(62) "Test Is The {Command Line -Stret (Interface 5More 9Words #Here"
https://ideone.com/jCRRMQ
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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