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<?php $a = []; $b = implode(',', $a); var_dump($b);
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/MOgck
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   5     1        INIT_FCALL                                               'implode'
         2        SEND_VAL                                                 '%2C'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $3      
         5        ASSIGN                                                   !1, $3
   7     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !1
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0