PHP学习笔记二

<?php
$t=date("H");
if ($t<"10")
{
    echo "Have a good morning!";
}
elseif ($t<"20")
{
    echo "Have a good day!";
}
else
{
    echo "Have a good night!";
}
?>

<?php
$favcolor="red";
switch ($favcolor)
{
case "red":
    echo "你喜欢的颜色是红色!";
    break;
case "blue":
    echo "你喜欢的颜色是蓝色!";
    break;
case "green":
    echo "你喜欢的颜色是绿色!";
    break;
default:
    echo "你喜欢的颜色不是 红, 蓝, 或绿色!";
}
?>

<?php
$x=array("one","two","three");
foreach ($x as $value){
    echo $value . "<br>";
}
?>

<br/>

<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>

<?php
$cars=array("Volvo","BMW","Toyota");
$arrlength=count($cars);
 
for($x=0;$x<$arrlength;$x++){
    echo $cars[$x];
    echo "<br>";
}
?>

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
echo "Peter is " . $age['Peter'] . " years old.";
?>

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
 
foreach($age as $x=>$x_value){
    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
}
?>

<pre> 
<?php 
$cars=array("Volvo","BMW","Toyota");  
sort($cars);  
print_r($cars); 
?> 
</pre>

<?php 
$x = 75; 
$y = 25;
 
function addition() { 
    $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y']; 
}
 
addition(); 
echo $z; //z是一个$GLOBALS数组中的超级全局变量，同样可以在函数外部访问
?>

<?php
function add($x,$y)
{
    $total=$x+$y;
    return $total;
}
 
echo "1 + 16 = " . add(1,16);
?>