First and Last Index of occurrence of value in PHP Array

Question

I have an array created in PHP as follows:

$arr = array(123,144,144,123);

How do I get the first and last indexes of occurrence of each value.
Something like,

123 -> first occurrence - 0th index | last occurrence - 3rd index
144 -> first occurrence - 1st index | last occurrence - 2nd index

Answer 1

Use array_search():

$arr = array(123,144,144,123);
$first = array_search(123, $arr); // 0
$last = array_search(123, array_reverse($arr, true)); // 3

Read more: http://php.net/manual/en/function.array-search.php