How to swap keys with values in array?

问题

I have array like:

array(
  0 => 'a',
  1 => 'b',
  2 => 'c'
);

I need to convert it to:

array(
  'a',
  'b',
  'c'
);

What's the fastest way to swap keys with values?

回答1:

PHP has the array_flip function which exchanges all keys with their corresponding values, but you do not need it in your case because the arrays are the same.

array(
  'a',
  'b',
  'c'
);

This array has the keys 0, 1, and 2.

回答2:

Use array_flip(). That will do to swap keys with values. However, your array is OK the way it is. That is, you don't need to swap them, because then your array will become:

array(
  'a' => 0,
  'b' => 1,
  'c' => 2
);

not

array(
  'a',
  'b',
  'c'
);

回答3:

array(
  0 => 'a',
  1 => 'b',
  2 => 'c'
);

and

array(
  'a',
  'b',
  'c'
);

are the same array, the second form has 0,1,2 as implicit keys. If your array does not have numeric keys you can use array_values function to get an array which has only the values (with numeric implicit keys).

Otherwise if you need to swap keys with values array_flip is the solution, but from your example is not clear what you're trying to do.