PHP My 辞書

in_array

$list = [1, 2, 3, 4, 5];
in_array(5, $list, true);

str_split

$str = 'Hello World';
$arr = str_split($str);

trim(fgets(STDIN))

標準入力

array_search

$list = [1, 2, 3, 4, 5,];
$index = array_search(5, $list, true);