serwerowe_mendela/Lekcja_01/index.php

<!DOCTYPE html>
<html lang="pl">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>GET, POST, if</title>
</head>
<body>
    <h1>Pobieranie wartości z formularza, instrukcja warunkowa</h1>
    <h2>1</h2>
    <form action="./" method="post">
        <input type="text" name="tekst1"><input type="submit" value="ok"><br>
        <?= "wpisano: " . @$_POST['tekst1']?>
    </form>

    <h2>2</h2>
    <form action="./wynik.php" method="post">
        <h3>Ile masz lat</h3>
        <input type="number" name="wiek" min="0" max="100" value="12">
        <input type="submit" value="ok">
    </form>

    <h2>3</h2>
    <form action="./" method="get">
        <h3>Czy Impuls II to najlepszy EZT?</h3>
        <select name="impuls">
            <option value="t">tak</option>
            <option value="n">nie</option>
        </select>
        <input type="submit" value="ok">
        <?php
            if(@$_GET['impuls'] == 't') {
                echo '<p>Człowiek kultury.</p>';
            } elseif(@$_GET['impuls'] == 'n') {
                echo '<p>WTF?! Odpuszczę ci tylko gdy uważasz że Stadler FLIRT jest lepszy.</p>';
            } else {
                echo '<p>Hmmm?!</p>';
            }
        ?>
    </form>

    <h2>4</h2>
    <form action="./" method="post">
        <input type="number" name="liczba1">
        <select name="operacja">
            <option><</option>
            <option><=</option>
            <option>=</option>
            <option>>=</option>
            <option>></option>
        </select>
        <input type="number" name="liczba2">
        ? <input type="submit" value="ok">
    </form>
    <?php
        switch (@$_POST['operacja']) {
            case '<':
                if(@$_POST['liczba1'] < @$_POST['liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '<=':
                if(@$_POST['liczba1'] <= @$_POST['liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '=':
                if(@$_POST['liczba1'] == @$_POST['liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '>=':
                if(@$_POST['liczba1'] >= @$_POST['liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '>':
                if(@$_POST['liczba1'] > @$_POST['liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
        }
    ?>
        
    <h2>5</h2>
    <form action="./" method="post">
        <input type="number" name="_liczba1">
        <select name="_operacja">
            <option><</option>
            <option><=</option>
            <option>=</option>
            <option>>=</option>
            <option>></option>
        </select>
        <input type="number" name="_liczba2">
        ? <input type="image" alt="ok" width="40px" src="https://img.freepik.com/premium-wektory/znak-ok-z-ikona-symbolu-reki_423491-228.jpg?semt=ais_hybrid&w=740&q=80">
    </form>
    <?php
        switch (@$_POST['_operacja']) {
            case '<':
                if(@$_POST['_liczba1'] < @$_POST['_liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '<=':
                if(@$_POST['_liczba1'] <= @$_POST['_liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '=':
                if(@$_POST['_liczba1'] == @$_POST['_liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '>=':
                if(@$_POST['_liczba1'] >= @$_POST['_liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
            case '>':
                if(@$_POST['_liczba1'] > @$_POST['_liczba2']) {
                    echo "<p>TAK</p>";
                } else {
                    echo "<p>NIE</p>";
                }
                break;
        }
    ?>

    <h2>6</h2>
    <form action="./" method="post">
        <h3>Wpisz współczynniki równania kwadratowego</h3>
        <input type="number" name="a">x<sup>2</sup>+
        <input type="number" name="b">x+
        <input type="number" name="c">=0
        <input type="submit" value="oblicz pierwiastki">
    </form>
    <?php
        if(isset($_POST['a']) && isset($_POST['b']) && isset($_POST['c'])) {
            $delta=($_POST['b'] ** 2) - (4 * $_POST['a'] * $_POST['c']);
            echo "delta=$delta<br>";
            if($delta < 0) {
                echo "brak pierwiastkow";
            } elseif($delta == 0) {
                $x0=(-$_POST['b'])/(2*$_POST['a']);
                echo "x<sub>0</sub>=$x0";
            } else {
                $x1=(-$_POST['b']-sqrt($delta))/(2*$_POST['a']);
                $x2=(-$_POST['b']+sqrt($delta))/(2*$_POST['a']);
                echo "x<sub>1</sub>=$x1<br>x<sub>2</sub>=$x2";
            }
        }
    ?>

    <h2>7</h2>
    <form action="./" method="post">
        <h3>Wpisz współczynniki równania kwadratowego</h3>
        <input type="number" name="_a">x<sup>2</sup>+
        <input type="number" name="_b">x+
        <input type="number" name="_c">=0
        <input type="submit" value="oblicz pierwiastki"><br><br>
    </form>
    <?php
        if(isset($_POST['_a']) && isset($_POST['_b']) && isset($_POST['_c'])) {
            $delta=($_POST['_b'] ** 2) - (4 * $_POST['_a'] * $_POST['_c']);
            echo "&Delta;=<input style='color: red;' size=1 disabled value='$delta'> ";
            if($delta < 0) {
                echo "brak pierwiastkow";
            } elseif($delta == 0) {
                $x0=(-$_POST['_b'])/(2*$_POST['_a']);
                echo "x<sub>0</sub>=<input style='color: green;' disabled value='$x0'>";
            } else {
                $x1=(-$_POST['_b']-sqrt($delta))/(2*$_POST['_a']);
                $x2=(-$_POST['_b']+sqrt($delta))/(2*$_POST['_a']);
                echo "x<sub>1</sub>=<input style='color: green;' disabled value='$x1'> x<sub>2</sub>=<input style='color: green;' disabled value='$x2'>";
            }
        }
    ?>

</body>
</html>