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Comment on \d less efficient than [0-9]parent

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As of PHP 5.3, PHP-powered software is safe. Using

    is_numeric('١٣٦٨') // -> false
    preg_match('/\d/', '١٣٦٨') // -> no match / false
    filter_var('١٣٦٨', FILTER_VALIDATE_INT) // -> false
Which I'm thankful for. I should hope that most people understand base-10 and ascii numbers. I don't want to have to worry about properly validating/handling unicode characters with number parsing.

In PHP 5.4.15, I get:

  var_dump(preg_match('/\d/u', '١٣٦٨')) -> 1
  var_dump(preg_match('/\d/', '١٣٦٨'))  -> 0
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