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<?php $test = 'aaa,test'; $locations = explode(',', $test); var_dump($locations); var_dump(array_shift($locations));
based on pjKk4
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5esou
function name:  (null)
number of ops:  16
compiled vars:  !0 = $test, !1 = $locations
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'aaa%2Ctest'
   4     1        INIT_FCALL                                               'explode'
         2        SEND_VAL                                                 '%2C'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $3      
         5        ASSIGN                                                   !1, $3
   6     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !1
         8        DO_ICALL                                                 
   7     9        INIT_FCALL                                               'var_dump'
        10        INIT_FCALL                                               'array_shift'
        11        SEND_REF                                                 !1
        12        DO_ICALL                                         $6      
        13        SEND_VAR                                                 $6
        14        DO_ICALL                                                 
        15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0