数组复制值到PHP中的键[重复]

Question

This question already has an answer here:

• Create an assoc array with equal keys and values from a regular array 3 answers

I have this array:

$a = array('b', 'c', 'd');

Is there a simple method to convert the array to the following?

$a = array('b' => 'b', 'c' => 'c', 'd' => 'd');

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Answer 1

$final_array = array_combine($a, $a);

http://php.net/array-combine

P.S.

* Be careful with similar values. For example:
array('one','two','one') may be problematic if converted like duplicate keys:
array('one'=>..,'two'=>..,'one'=>...)