【php】配列に何種類の値が入っているか

array_count_valuesか、array_uniqueを使う。

$array = [1,2,3,4,5,6,7,8,9,10,"a","b","c","d","",1,2,3,4,5,6,7,8,9,10];

echo "array_count_values:".count(array_count_values($array));//15
echo "<br />";
echo "array_unique:".count(array_unique($array));//15

//var_dump(array_count_values($array));
//array(15) { [1]=> int(2) [2]=> int(2) [3]=> int(2) [4]=> int(2) [5]=> int(2) [6]=> int(2) [7]=> int(2) [8]=> int(2) [9]=> int(2) [10]=> int(2) ["a"]=> int(1) ["b"]=> int(1) ["c"]=> int(1) ["d"]=> int(1) [""]=> int(1) }
//var_dump(array_unique($array));
//array(15) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) [7]=> int(8) [8]=> int(9) [9]=> int(10) [10]=> string(1) "a" [11]=> string(1) "b" [12]=> string(1) "c" [13]=> string(1) "d" [14]=> string(0) "" }

カウントする対象は、文字列か数値のみ