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<?php $sentence = strtolower('Cozy Qbert honks grawlix'); $usage = count_chars($sentence, 3); $alphabet = range('a', 'z'); var_export([ 'Sentence' => $sentence, 'Total Length' => strlen($sentence), 'Alphabetical Length' => preg_match_all('~[a-z]~', $sentence, $letters), 'Unused Letters' => array_diff($alphabet, $letters[0]), 'Duplicated Letters' => array_diff(array_count_values($letters[0]), [1]), ]);
based on X4kTQ
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HMFZn
function name:  (null)
number of ops:  42
compiled vars:  !0 = $sentence, !1 = $usage, !2 = $alphabet, !3 = $letters
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'strtolower'
         1        SEND_VAL                                                 'Cozy+Qbert+honks+grawlix'
         2        DO_ICALL                                         $4      
         3        ASSIGN                                                   !0, $4
   4     4        INIT_FCALL                                               'count_chars'
         5        SEND_VAR                                                 !0
         6        SEND_VAL                                                 3
         7        DO_ICALL                                         $6      
         8        ASSIGN                                                   !1, $6
   5     9        INIT_FCALL                                               'range'
        10        SEND_VAL                                                 'a'
        11        SEND_VAL                                                 'z'
        12        DO_ICALL                                         $8      
        13        ASSIGN                                                   !2, $8
   6    14        INIT_FCALL                                               'var_export'
   7    15        INIT_ARRAY                                       ~10     !0, 'Sentence'
   8    16        STRLEN                                           ~11     !0
        17        ADD_ARRAY_ELEMENT                                ~10     ~11, 'Total+Length'
   9    18        INIT_FCALL                                               'preg_match_all'
        19        SEND_VAL                                                 '%7E%5Ba-z%5D%7E'
        20        SEND_VAR                                                 !0
        21        SEND_REF                                                 !3
        22        DO_ICALL                                         $12     
        23        ADD_ARRAY_ELEMENT                                ~10     $12, 'Alphabetical+Length'
  10    24        INIT_FCALL                                               'array_diff'
        25        SEND_VAR                                                 !2
        26        FETCH_DIM_R                                      ~13     !3, 0
        27        SEND_VAL                                                 ~13
        28        DO_ICALL                                         $14     
        29        ADD_ARRAY_ELEMENT                                ~10     $14, 'Unused+Letters'
  11    30        INIT_FCALL                                               'array_diff'
        31        INIT_FCALL                                               'array_count_values'
        32        FETCH_DIM_R                                      ~15     !3, 0
        33        SEND_VAL                                                 ~15
        34        DO_ICALL                                         $16     
        35        SEND_VAR                                                 $16
        36        SEND_VAL                                                 <array>
        37        DO_ICALL                                         $17     
        38        ADD_ARRAY_ELEMENT                                ~10     $17, 'Duplicated+Letters'
        39        SEND_VAL                                                 ~10
        40        DO_ICALL                                                 
  12    41      > RETURN                                                   1

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