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<?php $a = '1234'; $b = '34564'; $z[1] = &$a; $x[] = &$z[1]; $z[1] = &$b; var_dump($a, $b, $z, $x);
Output for 4.3.0 - 7.1.0
string(4) "1234" string(5) "34564" array(1) { [1]=> &string(5) "34564" } array(1) { [0]=> &string(4) "1234" }