<?php

error_reporting( 0 );

$program_a = 'echo A;E925Z9A;';

$program_b = 'echo B; zzzzzz;';

eval( $program_a );

eval( $program_b );

eval( $program_c = $program_a ^ $program_b );

echo PHP_EOL, 'a ^ b = ';

var_dump( $program_c );