Въведение в PHP

//1
        <?php
            echo date("d,M,Y,H,i,s");
        ?>
//2
    <?php

    $array=array(true,0,2.34,6,7454654,"s","string",$array2=array(1,2,3,4,5,6),);

    foreach ($array as $v)
    {
        echo $v.'======='.gettype($v).'<br>';
    }
//3
<!DOCTYPE html>
<html>
    <head>
        <title>HOHOHO</title>
    </head>
    <body>
    <?php
    $sideA=$_POST['sideA'];
    $sideB=$_POST['sideB'];
    $area=$sideA*$sideB;
    echo $area;
    ?>
        <form method="post" action="AreaOfRectangle.php">
            <input type="number" name="sideA">
            <input type="number" name="sideB">
            <input type="submit" value="Calculate">
        </form>
    </body>
</html>

//4
<!DOCTYPE html>
<html>
    <head>
        <title>HOHOHO</title>
    </head>
    <body>
<?php

$pointA=array($_POST['PointACoordX'],$_POST['PointACoordY']);
$pointB=array($_POST['PointBCoordX'],$_POST['PointBCoordY']);
$pointC=array($_POST['PointCCoordX'],$_POST['PointCCoordY']);

$area=round(abs(($pointA[0]*($pointB[1]-$pointC[1]))+
      ($pointB[0]*($pointC[1]-$pointA[1]))+
      ($pointC[0]*($pointA[1]-$pointB[1])))/2);
if ($area!=NULL)
{
    echo $area;
}
else
{
    echo 0;
}
?>
        <form method="post" action="TriangleArea.php">
            PointACoordX:<input type="number" name="PointACoordX">
            PointACoordY:<input type="number" name="PointACoordY">
            PointBCoordX:<input type="number" name="PointBCoordX">
            PointBCoordY:<input type="number" name="PointBCoordY">
            PointCCoordX:<input type="number" name="PointCCoordX">
            PointCCoordY:<input type="number" name="PointCCoordY">
            <input type="submit" value="Calculate">
        </form>
</body>
</html>


//5
<?php

$isFemale=false;
echo 'My gender is Female:   '.var_export($isFemale,true);


//6
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
<body>
<?php
$str1='I asked a girl out and she said – “I don\'t know”. Does she mean yes or no?';
$str2="I asked a girl out and she said – “I don't know”. Does she mean yes or no?";
echo $str1.'<br>';
echo$str2;?>

</body>
</html>


//7
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>hihi</title>
</head>
<body>
<?php
$number=$_POST['asd'];
echo $number.'<br>';
echo (int)$number;
?>
    <form method="post" action="TypeCasting.php">
        <input type="text" name="asd">
        <input type="submit" value="CAST!">
    </form>
</body>
</html>


//8
<!DOCTYPE html>
<html>
    <head>
        <title>HOHOHO</title>
    </head>
    <body>
<?php
        $h = '<h1>Hello World</h1>';
        $p = '<p>I love Software Univerity</p>';
        echo htmlspecialchars($h) . "</br>";
        echo htmlspecialchars($p);
?>
    </body>
</html>


//9
<html>
    <head>
        <meta charset="UTF-8">
        <title>imence</title>
    </head>
    <body>
    <?php
    $number=$_POST['number'];
    if ($number % 2 == 0)
    {
        echo $number.'\\2 has remainder'."  ".($number%2).'<br>';
        if ($number%9 == 0)
        {
        echo $number.'\\9 has remainder'."  ".($number%9);
        }
    }
    else
        echo 'false';
    ?>
        <form method="post" action="divideBy2and9.php">
            <input type="text" name="number">
            <input type="submit" value="Divide">
        </form>
    </body>
</html>

//10
<html>
    <head>
        <meta charset="UTF-8">
        <title>xaxa</title>
    </head>
    <body>
    <?php
        $number=$_POST['number'];
        if($number[strlen($number)-3]==7)
        {
            echo 'it`s seven';
        }
        else
            {
            echo 'it is not';
            }
    ?>
        <form method="post" action="ThirdDigitIsSeven.php">
        <input type="number" name="number">
        <input type="submit" value="check">
        </form>
    </body>
</html>

//11
<html>
    <head>
        <meta charset="UTF-8">
        <title>pkoko</title>
    </head>
    <body>
        <form method="post" action="PrintNNumbers.php">
            <input type="number" name="number">
            <input type="submit" value="GO">
        </form>
         <?php
        $numbers=$_POST['number'];
        for($i;$i<=$numbers;$i++)
        {
            echo $i.'<br>';
        }
        ?>
    </body>
</html>


//12
<html>
    <head>
        <meta charset="UTF-8">
        <title>pkoko</title>
    </head>
    <body>
        <form method="post" action="FirstNFibonacciNumbers.php">
            <input type="number" name="number">
            <input type="submit" value="GO">
        </form>
        <?php
        $numbers=$_POST['number'];
        $fibonaci[0]=0;
        $fibonaci[1]=1;
        for($i=2;$i<=$numbers;$i++)
        {
            $fibonaci[$i] = $fibonaci[$i-1]+$fibonaci[$i-2];
        }
        echo '<pre>' . print_r($fibonaci, true) . '</pre>';
        ?>
    </body>
</html>