php study note 2 --- basic syntax-优快云博客

本文链接：https://blog.youkuaiyun.com/xuyunzhang/article/details/6628022

1. the fisrt php code

root@vinco:/var/www# ls
\  index.html  testphp  w3cschool.php
root@vinco:/var/www# mv testphp test.php

<?
phpinfo();
?>

2. for() foreach() switch-case, if-else,if-elseif-else

root@vinco:/var/www# vim syntax1.php

<html>
<body>
<?php
        /* for variable and echo  */
        $txt="hello world";
        echo $txt . " " . ","."vinco<br/>";

        /* for if-elseif-else sentence */
        $d=date("D");
        if($d=="Fri")
        {
                echo "<br/>Hello!<br/>";
                echo "Have a nice weekend!";
                echo "See you on monday!<br/><br/>";
        }
        elseif($d=="Sun")
        {
                echo "have a nice sunday<br/>";
        }
        else
        {
                echo "have a nice workday<br/>";
        }

        /* for array, for,foreach,switch--case sentence  */
        $week=array( "sunday"=>0,"monday"=>1,"tuesday"=>2,"wenesday"=>3,"thursday"=>4,"friday"=>5,"satday"=>6 );
        for($day=$week['sunday'];$day <= $week['satday'];$day++)
        //foreach($week as $day)
        {
                switch($day)
                {
                case 0: echo "today is "."sunday!<br/> ";break;
                case 1: echo "today is "."monday!<br/> ";break;
                case 2: echo "today is "."tuesday!<br/> ";break;
                case 3: echo "today is "."wenesday!<br/> ";break;
                case 4: echo "today is "."thursday!<br/> ";break;

                default:break;
                }
                echo "<br/>";
        }

        /* for function */
        function add($x,$y)
        {
                $total=$x+$y;
                return $total;
        }
        echo "10+100 = ".add(10,100);

        /* for form */


?>
        <form action="welcom.php" method="post">
        Name:<input type="text" name="name" /><br/>
        Age&nbsp&nbsp&nbsp:<input type="text" name="age" /><br/>
        <input type="submit" /><br/>
        </form>
</body>
</html>