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6.php
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<?php
/**
* Created by PhpStorm.
* User: lozunoff
* Date: 02.12.2018
* Time: 21:42
* Задание: http://php720.com/task/6 - "Создание сокращенного варианта ФИО"
*/
?>
<form method="post">
<input type="text" name="lastName" value="<?= (isset($_POST['lastName'])) ? $_POST['lastName'] : '' ?>" placeholder="Фамилия">
<input type="text" name="firstName" value="<?= (isset($_POST['firstName'])) ? $_POST['firstName'] : '' ?>" placeholder="Имя">
<input type="text" name="middleName" value="<?= (isset($_POST['middleName'])) ? $_POST['middleName'] : '' ?>" placeholder="Отчество">
<button type="submit" name="go">Войти</button>
</form>
<?php
// Проверяем, что нажата кнопка "Войти"
if (isset($_POST['go'])) {
// Выводим сокращенный вариант ФИО
echo $_POST['lastName'] . " " . mb_substr($_POST['firstName'], 0, 1) . ". " . mb_substr($_POST['middleName'], 0, 1) . ".";
}