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<?php $array = array( 0 => array('user_id' => '1', 'email'=>'email1'), 1 => array('user_id' => '2', 'email'=>'email2'), 2 => array('user_id' => '3', 'email'=>'email3') ); //var_dump(array_flip($array));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PkgSH
function name:  (null)
number of ops:  2
compiled vars:  !0 = $array
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    8     1      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
149.99 ms | 1392 KiB | 13 Q