Gets the key value of the last element of the array

Today a scene needs to get the maximum key value of an array,

Like what:

$arr = Array (    1,     6  = 2,     9  = 5, and     1);

If you want to get to 21, then you have to

$maxKey = 0;foreach ($arr as $k = = $v) {    if ($k > $maxKey) {        $maxKey = $k;    }}

Think this is more troublesome, later looked up the information, found that it can also,

Ksort ($arr); end ($arr); Echo key ($arr);

When k is sorted, use end to point the pointer to the last element of the array, and then output the key of the array.

Also, reverse the array and take the maximum value, but this will change the array

echo Max (Array_flip ($arr));

And, of course, get all the keys first and then get the biggest key.

$keys = Array_keys ($arr); echo Max ($keys);

As to which of the better ... Not currently tested.

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The above describes the acquisition of the last element of the array key value, including the contents of the content, I hope that the PHP tutorial interested in a friend to help.

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