Arrays

//1.Print Array
<!DOCTYPE html>
<html>
<head>
    <title>Print Array</title>
</head>
<body>
    <?php
        $myArray = array(4, 2, 6, 1, 6, 4, 8, 34, 75, 1, 54, 2, 7, 9, 3, 16, 43, 86, 32, 5);

        foreach ($myArray as $key => &$value) {
            $value = $key*5;
        }

        echo '<pre>' . print_r($myArray, true) . '</pre>';

    ?>
</body>
</html>


//2.Largest Sequence of Equal Strings
<!DOCTYPE html>
<html>
<head>
    <title>Print Array</title>
</head>
<body>
    <form method="post">
        <input type="text" name="text">
        <input type="submit" value="Go">
        </form>
    <?php
        $myStr = $_POST['text'];
        $array = explode(" ", $myStr);
        $myArr = array_count_values($array);
        foreach ($myArr as $key => $value) {
            $value = max($myArr);
            $key = array_search($value, $myArr);

        }
        for ($i=1; $i <= max($myArr) ; $i++) {
            echo "$key ";
        }
    ?>
</body>
</html>


//4.Selection Sort
<!DOCTYPE html>
<html>
<head>
    <title>Selection Sort</title>
</head>
<body>
    <form method="post">
        <input type="text" name="text">
        <input type="submit" value="Go">
    </form>
    <?php
        $myStr = $_POST['text'];
        $array = explode(" ", $myStr);
        $buffer = "";
        echo '<pre>' . print_r($array, true) . '</pre>';
        for ($i = 0; $i < count($array) - 1; $i++) {
            for ($j = $i + 1; $j < count($array); $j++) {
                if ((int)$array[$i] > (int)$array[$j]) {
                    $buffer = $array[$i];
                    $array[$i] = $array[$j];
                    $array[$j] = $buffer;
                }
            }
        }
        echo '<pre>' . print_r($array, true) . '</pre>';

    ?>
</body>
</html>


//5.Simple Calculator
<!DOCTYPE html>
<html>
<head>
    <title>Selection Sort</title>
</head>
<body>
    <form method="POST">
        <label for="first">Enter First Number</label>
        <input type="text" id="first" name="first">
        <br>
        <label for="operator">Select Operator</label>
        <select name="operator" id="operator">
            <option value="plus">+</option>
            <option value="minus">-</option>
            <option value="multiplication">*</option>
            <option value="divide">/</option>
        </select>
        <br>
        <label for="second">Enter Second Number</label>
        <input type="text" name="second" id="second">
        <br>
        <input type="submit" value="Calculate">
    </form>
    <?php
        $first = $_POST['first'];
        $second = $_POST['second'];
        $operator = $_POST['operator'];
        if ($operator == "plus") {
            $result = $first + $second;
        }
        if ($operator == "minus") {
            $result = $first - $second;
        }
        if ($operator == "multiplication") {
            $result = $first * $second;
        }
        if ($operator == "divide") {
            $result = $first / $second;
        }
        echo "Output = $result";
    ?>
</body>
</html>