PHP/Data Type/Char

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Predefined Characters and Classes

   <source lang="html4strict">

Character Meaning \a Beep \n Newline character \r Carriage return \t Tab \f Formfeed \e Escape \d Digit (same as [0-9]) \D Nondigit character (same as [^0-9]) \w Word character (same as [a-zA-Z0-9_]) \W Nonword character \s White-space character (same as [ \t\n\r\f]) \S Non White-space character \xX Hexadecimal digit \cX Matches the corresponding control character

      </source>
   
  


String char count

   <source lang="html4strict">

<? $twister = "Peter Piper picked a peck of pickled peppers"; print("$twister
"); $letter_array = count_chars($twister, 1); while ($cell = each($letter_array)){

 $letter = chr($cell["key"]);
 $frequency = $cell["value"];
 print("Character: "$letter"; frequency:  $frequency
");

} ?>

      </source>