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How arrays embedded in strings will be converted

<?php $arr = array(   1 => "abc",   "abc" => 123.5,   array(1,2,3) ); $key = "abc"; echo "First value = $arr[1]\n"; echo "Second value = $arr[abc]\n"; echo "Third value = $arr[2]\n"; echo "Third value = $arr[2][2]\n"; echo "Second value = ${arr['abc']}\n"; echo "Second value = ${arr["abc"]}\n"; echo "Second value = ${arr[$key]}\n"; ?>