ttt, Php - rextester

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<?php

/*
        Task - 1
*/

echo "\n";
echo "\n";
echo 'Task - 1';
echo "\n";
echo "\n";

$name = 'Vasya';
$surname= 'Pupkin';
$birthday = '01.01.1981';
$midle_name = 'Petrovich';
$phone = '38099999999';
$email = 'user@ukr.net';
$experience = 15;
$salary = 5000;

echo <<<"HEREDOC"
-------------------
Name: $name
Surname: $surname
Midle name: $midle_name
Birthday: $birthday
Phone: $phone
Email: $email
Experience: $experience
Salary: $salary
-------------------
HEREDOC;

/*
           Task - 2
*/
echo "\n";
echo "\n";
echo 'Task - 2';
echo "\n";
echo "\n";

$bank_account = 10000;
$bank_card1 = &$bank_account;
$bank_card2 = &$bank_account;

$bank_card1 -= 500;
echo $bank_card1;
echo "\n";
echo $bank_account;

echo "\n";

$bank_card2 -= 5000;
echo $bank_card2;
echo "\n";
echo $bank_account;

/*
        Task - 3
*/

echo "\n";
echo "\n";
echo 'Task - 3';
echo "\n";
echo "\n";

function number_sum($number)
{
    $res=0;
    for ($i = 0; $i < 5; $i++)
    {
        $res += (int)((string)$number)[$i];
    }
    echo "\n";
    echo $res;
    echo "\n";
}

number_sum(12345);

[ + ] Show input
Absolute running time: 0.18 sec, cpu time: 0.05 sec, memory peak: 25 Mb, absolute service time: 0,26 sec