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<?php $a = "\t123456\t345\t575675\t676\t333"; for($i = 0; $i< 10; $i++){ $a .= $a; } $start = time(); $startMicro = microtime(); $result = explode("\t", $a)[0]; var_dump('Explode:' . ((time() - $start) + (microtime() - $startMicro) / 1000));
based on dEVvZ
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
2 jumps found. (Code = 44) Position 1 = 8, Position 2 = 3
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 3
2 jumps found. (Code = 44) Position 1 = 8, Position 2 = 3
Branch analysis from position: 8
Branch analysis from position: 3
filename:       /in/alk68
function name:  (null)
number of ops:  33
compiled vars:  !0 = $a, !1 = $i, !2 = $start, !3 = $startMicro, !4 = $result
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '%09123456%09345%09575675%09676%09333'
   4     1        ASSIGN                                                   !1, 0
         2      > JMP                                                      ->6
   5     3    >   ASSIGN_CONCAT                                 0          !0, !0
   4     4        POST_INC                                         ~8      !1
         5        FREE                                                     ~8
         6    >   IS_SMALLER                                       ~9      !1, 10
         7      > JMPNZ                                                    ~9, ->3
   8     8    >   INIT_FCALL                                               'time'
         9        DO_ICALL                                         $10     
        10        ASSIGN                                                   !2, $10
   9    11        INIT_FCALL                                               'microtime'
        12        DO_ICALL                                         $12     
        13        ASSIGN                                                   !3, $12
  11    14        INIT_FCALL                                               'explode'
        15        SEND_VAL                                                 '%09'
        16        SEND_VAR                                                 !0
        17        DO_ICALL                                         $14     
        18        FETCH_DIM_R                                      $15     $14, 0
        19        ASSIGN                                                   !4, $15
  14    20        INIT_FCALL                                               'var_dump'
        21        INIT_FCALL                                               'time'
        22        DO_ICALL                                         $17     
        23        SUB                                              ~18     $17, !2
        24        INIT_FCALL                                               'microtime'
        25        DO_ICALL                                         $19     
        26        SUB                                              ~20     $19, !3
        27        DIV                                              ~21     ~20, 1000
        28        ADD                                              ~22     ~18, ~21
        29        CONCAT                                           ~23     'Explode%3A', ~22
        30        SEND_VAL                                                 ~23
        31        DO_ICALL                                                 
        32      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0