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<?php // the unroll: $arr = array(1 => 'one', 2 => 'two', 3 => 'three'); $a = &$arr[1]; // first iteration var_dump($a,$arr); $a = &$arr[2]; var_dump($a,$arr); $a = &$arr[3]; var_dump($a,$arr); // 2nd unroll : following up with another foreach -- $a is still a reference for $arr[3] $a = $arr[1]; $a = $arr[2]; $a = $arr[3];
Output for 5.2.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "one" array(3) { [1]=> &string(3) "one" [2]=> string(3) "two" [3]=> string(5) "three" } string(3) "two" array(3) { [1]=> string(3) "one" [2]=> &string(3) "two" [3]=> string(5) "three" } string(5) "three" array(3) { [1]=> string(3) "one" [2]=> string(3) "two" [3]=> &string(5) "three" }
Output for 4.3.0 - 5.2.0
string(3) "one" array(3) { [1]=> &string(3) "one" [2]=> string(3) "two" [3]=> string(5) "three" } string(3) "two" array(3) { [1]=> &string(3) "one" [2]=> &string(3) "two" [3]=> string(5) "three" } string(5) "three" array(3) { [1]=> &string(3) "one" [2]=> &string(3) "two" [3]=> &string(5) "three" }