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<?php $a = array( 1 => array( 'test' => 3 ) ); $b = array( 1 => array( 'test2' => 3 ) ); $c = array_replace_recursive( $a, $b ); var_dump( $c );
based on r5paG
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tKr5Z
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   QM_ASSIGN                                                !0
   4     1        QM_ASSIGN                                                !1
   5     2        INIT_FCALL                                               'array_replace_recursive'
         3        SEND_VAR                                                 !0
         4        SEND_VAR                                                 !1
         5        DO_ICALL                                         $5      
         6        QM_ASSIGN                                                !2
   6     7        INIT_FCALL                                               'var_dump'
         8        SEND_VAR                                                 !2
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0