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  1. <?php
  2.  
  3. function clean_input_keys($str) {
  4.     $pattern = '#^[&a-zA-Z0-9\.:_/\s-]+$#uD';
  5.     $b_preg_match = preg_match($pattern, $str);
  6.     var_dump($b_preg_match); //false //preg_match() returns FALSE if an error occurred. 
  7.     if ( !$b_preg_match) {
  8.         exit('Disallowed key characters in global data.');
  9.     }
  10.     return $str;
  11. }
  12.  
  13. $str="my_session";
  14. echo clean_input_keys($str);
  15.  
  16.  
Success #stdin #stdout 0.02s 82944KB
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stdin
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Standard input is empty
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int(1)
my_session
https://ideone.com/0OTDLH
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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