init

category.php

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+<?php
+require_once __DIR__ . '/functions.php';
+
+$cat = " na2t5u25re spo12r54t funn82y cake2! 8sea au#!tumn!";
+$cat_temp = parseCategories($cat);
+
+$categories = [];
+foreach ($cat_temp as $cat) {
+    $digits  = preg_replace('/\D/', '', $cat);
+    $letters = preg_replace('/[^a-zA-Z]/', '', $cat);
+    $random = random_int(1000, 5000);
+
+    $categories[$random + intval($digits)] = $letters;
+}
+ksort($categories);
+
+var_dump($categories);

config.php

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+<?php
+declare(strict_types=1);
+
+const PARAMS = [
+    "HOST" => 'localhost',
+    "USER" => 'integ_user',
+    "PASSWORD" => '323446',
+    "DB" => 'web_prog_task_15',
+    "CHARSET" => 'utf8mb4'
+];
+
+$dsn = "mysql:host=" . PARAMS['HOST'] . ";dbname=" . PARAMS['DB'] . ";charset=" . PARAMS['CHARSET'];
+
+$pdoOptions = [
+    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    PDO::ATTR_EMULATE_PREPARES => false
+];

functions.php

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+<?php
+require_once __DIR__ . "/config.php";
+
+$pdo = connectDatabase($dsn, $pdoOptions);
+
+/** Function tries to connect to database using PDO
+ * @param string $dsn
+ * @param array $pdoOptions
+ * @return PDO
+ */
+function connectDatabase(string $dsn, array $pdoOptions): PDO
+{
+
+    try {
+        $pdo = new PDO($dsn, PARAMS['USER'], PARAMS['PASSWORD'], $pdoOptions);
+    } catch (\PDOException $e) {
+        var_dump($e->getCode());
+        throw new \PDOException($e->getMessage());
+    }
+
+    return $pdo;
+}
+
+function parseCategories(string $cat_string)
+{
+    $cat_string = trim($cat_string);
+    $cats = explode(" ", $cat_string);
+
+    $filtered_cats = array_filter($cats, function($cat) {
+        if(mb_strlen($cat) <= 4)
+            return false;
+
+        return(ctype_alnum($cat));
+    });
+
+    return $filtered_cats;
+}
+
+function insertCategories(array $cats) {
+    global $pdo;
+
+    try {
+        $pdo->beginTransaction();
+
+        $stmt = $pdo->prepare("INSERT INTO categories (name, code) VALUES (:name, :code)");
+        foreach ($cats as $cat_code => $cat_name) {
+            $stmt->execute([
+                ':name' => $cat_name,
+                ':code' => $cat_code
+            ]);
+        }
+
+        $pdo->commit();
+    }
+    catch (Exception $e) {
+        $pdo->rollBack();
+        throw $e;
+    }
+}
+
+class User {
+    function createUser() {
+
+    }
+    function createUserStmt() {
+
+    }
+    function createUsers() {
+        
+    }
+}

insert.php

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+<?php 
+require_once __DIR__ . "/category.php";
+
+insertCategories($categories);

readme.md

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+1. Umesto `getCategories` bolje nazvati funkciju `parseCategories` zato sta `get...` podrazumeva samo dobijanje podataka (npr., iz db), a ne odbradu string-a.
+2. `createUsers` osim toga, sta kreira korisnika rade parsiranje iz string-ova i autogenerisanje random podataka šta predstavlja **God Function** i uništava **Single Responsibility Principle**. 
+Bolje uraditi klas `User` koji će imati `createUserStmp`, `createUser` i `createUsers` koji uzimaju prototip objekata od klasa User.