新手通过实例学习动态网页PHP的语法

$fruit[] = 'banana';
$fruit[] = 'papaya';

你也可以用多维数组：

$people['David']['shirt'] = 'blue';
$people['David']['car'] = 'minivan';
$people['Adam']['shirt'] = 'white';
$people['Adam']['car'] = 'sedan';

一个创建数组的简便方法是

array()

函数为：

$fruit = array('banana','papaya');
$favorites = array('animal' => 'turtle',
'monster' => 'cookie);

或者

$people = array ('David' => array('shirt' => 'blue',
'car' => 'minivan'),
'Adam' => array('shirt' => 'white',
'car' => 'sedan'));

内建函数count()表明一个数组里有多少元素：

$fruit = array('banana','papaya');
print count($fruit);

得到如下结果

2

控制结构

你可以利用循环结构例如for以及while：

for ($i = 4; $i < 8; $i++) {
print "I have eaten $i bagels today.\n"; }

结果

I have eaten 4 bagels today.
I have eaten 5 bagels today.
I have eaten 6 bagels today.
I have eaten 7 bagels today.

同样可写为

$i = 4; while ($i < 8) {
print "I have eaten $i bagels today.\n";
$i++;
}

你可以使用控制结构if以及elseif：

if ($user_count > 200) {
print "The site is busy right now!";
}
 elseif ($user_count > 100) {
print "The site is sort of active right now!";
else {
print "The site is lonely - only $user_count user logged on.";
}

使用运算符的经验法则同样也可以运用在控制结构上面。你还可以使用switch，do...while，甚至是 ?: 结构。