candrasetiadi

<?php
class Palindrome
{
    public static function isPalindrome($word)
    {
        $word = str_replace(' ', '', $word);
        $word = preg_replace('/[^A-Za-z0-9\-]/', '', $word);
        $word = strtolower($word);
        $reverse = strrev($word);
        

candrasetiadi

-- Write only the SQL statement that solves the problem and nothing else.
select count(firstName) from students where firstName = 'John'

candrasetiadi

-- Write only the SQL statement that solves the problem and nothing else.
SELECT S.name
FROM
  (SELECT a.id, a.managerId, a.name FROM employees AS a) AS S
LEFT JOIN 
  (SELECT e.id, e.managerId, e.name FROM employees as e WHERE e.managerId IS NOT NULL) AS T 
ON S.id = T.managerId
WHERE T.managerId IS NULL

candrasetiadi

<?php
class Pipeline
{
    public static function make_pipeline(...$funcs)
    {
        return function($arg) use ($funcs)
        {
            foreach ($funcs as $item) {
                $arg = $item($arg);
            }