serwerowe_mendela/Lekcja_01/petle.php

<!DOCTYPE html>
<html lang="pl">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Pętle</title>
    <style>
        table, td {
            border: 1px solid black;
        }
        .noborder { 
            border: none;
        }
        .noborder td {
            border: none;
        }
        th {
            background-color: gray;
        }
    </style>
</head>
<body>
    <h1>Pętle</h1>
    <h2>1</h2>
    <form action="./petle.php" method="post">
        <p>Ile cyfr wypisać</p>
        <input type="number" name="ile1">
        <input type="submit" value="ok">
    </form>
    <?php
        $i = 1;
        while($i <= @$_POST['ile1']) {
            echo $i . " ";
            $i++;
        }
    ?>

    <h2>2</h2>
    <form action="./petle.php" method="post">
        <p>Ile cyfr wypisać</p>
        <input type="number" name="ile2">
        <input type="submit" value="ok">
    </form>
    <?php
        if(isset($_POST['ile2'])) {
            $i = 1;
            do {
                echo $i . "<br>";
            } while (++$i <= $_POST['ile2']);
        }
    ?>

    <h2>3</h2>
    <form action="./petle.php" method="post">
        <p>Schodzimy do zera. Od ilu?</p>
        <input type="number" name="ile3">
        <input type="submit" value="ok">
    </form>
    <?php
        for($i = @$_POST['ile3']; $i > 0; $i--) {
            echo $i . " ";
        }
    ?>

    <h2>4</h2>
    <form action="./petle.php" method="post">
        <label for="start">start:</label>
        <input type="number" name="start" id="start" size=1>
        
        <label for="krok">krok:</label>
        <input type="number" name="krok" id="krok" size=1>

        <label for="koniec">koniec:</label>
        <input type="number" name="koniec" id="koniec" size=1>

        <input type="submit" value="ok">
    </form>
    <?php
        if(isset($_POST['start']) && isset($_POST['krok']) && isset($_POST['koniec'])) {
            if(intval($_POST['krok']) != 0) {
                if ((($_POST['start'] <= $_POST['koniec']) && ($_POST['krok'] > 0)) || (($_POST['start'] >= $_POST['koniec']) && ($_POST['krok'] < 0))) {
                    for($i = intval($_POST['start']); $i <= intval($_POST['koniec']); $i += intval($_POST['krok'])) {
                        echo $i . " ";     
                    }
                } else {
                    echo "Nie wykonam nieskończonej pętli!";
                }
            } else {
                echo "Nie wykonam nieskończonej pętli!";
            }
        }
    ?>

    <h2>5</h2>
    <form action="./wynik.php" method="post">
        <p>Ile masz lat?</p>
        <select name="wiek">
            <?php
                for($i = 1; $i < 134; $i++) {
                    echo "<option>$i</option>";
                }
            ?>
        </select>
        <input type="submit" value="ok">
    </form>

    <h2>6</h2>
    <form action="./petle.php" method="get">
        <p>Ile cyfr:</p>
        <input type="number" name="ile">

        <p>Kierunek:</p>
        <select name="kierunek">
            <option>Poziom</option>
            <option>Pion</option>
        </select>

        <p>Krok:</p>
        <input type="number" name="krok">
        <input type="submit" value="ok"><br><br>
    </form>

    <table>
    <?php
        for($i = 0; $i < @$_GET['ile']; $i++) {
            if(@$_GET['kierunek'] == 'Pion') {
                echo "<tr>";
            }
            echo '<td>' . $i * @$_GET['krok'] + 1 . '</td>';
            if(@$_GET['kierunek'] == 'Pion') {
                echo "</tr>";
            }
        }
    ?>
    </table>

    <h2>7</h2>
    <form action="./petle.php" method="post">
        Wierszy: <input type="number" name="wiersze">
        Kolumn: <input type="number" name="kolumny">
        <input type="submit" value="ok">
    </form>
    <table>
    <?php
        for($i = 0; $i < @$_POST['wiersze']; $i++) {
            echo "<tr>";
            for($j = 0; $j < @$_POST['kolumny']; $j++) {
                echo '<td>' . ($i * @$_POST['kolumny']) + $j + 1 . '</td>';
            }
            echo "</tr>";
        }
    ?>  
    </table>

    <h2>8</h2>
    <form action="./petle.php" method="post">
        SZACHOWNICA:
        Wierszy: <input type="number" name="szachownica_wiersze">
        Kolumn: <input type="number" name="szachownica_kolumny">
        <input type="submit" value="ok">
    </form>
    <table>
    <?php
        for($i = 0; $i < @$_POST['szachownica_wiersze']; $i++) {
            $black = false;
            if($i % 2 != 0) {
                $black = true;
            }
            echo '<tr>';
            for($j = 0; $j < @$_POST['szachownica_kolumny']; $j++) {
                echo '<td style="width: 16px; height: 16px; ';
                if($black) {
                    echo 'background-color: black;';
                }
                echo '"></td>';
                $black = !$black;
            }
            echo '</tr>';
        }
    ?>
    </table>

    <h2>9</h2>
    <form action="./petle.php" method="get">
        Rozmiar: <input type="number" name="tsize">
        <input type="submit" value="ok">
    </form>
    <table>
    <?php
        for($i = 0; $i < @$_GET['tsize']; $i++) {
            echo '<tr>';
            for($j = 0; $j < @$_GET['tsize']; $j++) {
                echo '<td>' . ($i + 1) * ($j + 1) . '</td>';
            }
            echo '</tr>';
        }
    ?>
    </table>

    <h2>10</h2>
    <form action="./petle.php" method="get">
        Rozmiar: <input type="number" name="tsize2">
        <input type="submit" value="ok">
    </form>

    <table class="noborder">
        <?php
            echo '<tr><td></td>';
            for($i = 0; $i < @$_GET['tsize2']; $i++) {
                echo '<th>' . $i+1 . '</th>';
            }
            echo '</tr>';
            for($i = 0; $i < @$_GET['tsize2']; $i++) {
                echo '<tr>';
                echo '<th>' . $i+1 . '</th>';
                for($j = 0; $j < @$_GET['tsize2']; $j++) {
                    echo '<td>' . ($i+1) * ($j+1) . '</td>';
                }
                echo '</tr>';
            }
        ?>
    </table>
</body>
</html>