对数组中出现的值进行计数，返回一次值

Posted 2021-02-25

I needed to trim a simple numerical array that might have duplicate values into an array with no duplicates. I came up with this before finding array_unique(). D'oh.

<?php 
 
$array = array(1,1,1,2,2,2,2,3);
 
function returnValueOnce($array){
 
     $arrayTrim = array_keys(array_count_values($array));
     //array_count_values returns an array( [1]=>3 [2]=> 4 [3]=> 1 ) 
 
     return $arrayTrim;
     //returns numerical array(1,2,3)
}
// the array_unique() function does this too, so now I'm the wiser....
 
// it removes duplicate values from an array. If two or more array values are the same, the // first appearance will be kept and the other will be removed.
?>