Learning PHP 5
By David Sklar
Publisher : O’Reilly
Pub Date : June 2004
ISBN : 0-596-00560-1
Pages : 368
Chapter:Text
1.校验字符
// $_POST['zipcode'] 来自表单提交的变量
// “zipcode”
$zipcode = trim($_POST['zipcode']);
// $zipcode 得到$_POST['zipcode']变量的值,并去掉变量前后带的空格.
$zip_length = strlen($zipcode);//获得变量$zipcode的长度
// 提示 ZIP code 不是5个字符的长度
if ($zip_length != 5) {
print “Please enter a ZIP code that is 5 characters long.”;
}
比较简略的写法
if (strlen(trim($_POST['zipcode'])) != 5) {
print “Please enter a ZIP code that is 5 characters long.”;
}
2.比较字符串
if ($_POST['email'] == ‘president@whitehouse.gov’) {
print “Welcome, Mr. President.”;
}
注意:这里的president@whitehouse.GOV 不匹配 President@Whitehouse.Gov or president@whitehouse.gov.因为它使用的是 == .
忽略大小写的比较方法.
if (strcasecmp($_POST['email'], ‘president@whitehouse.gov’) == 0) {
print “Welcome back, Mr. President.”;
}
3.字符格式化-货币格式
$price = 5; $tax = 0.075;
printf(’The dish costs $%.2f’, $price * (1 + $tax));
显示为:
The dish costs $5.38
4.字符格式化-填充零
$zip = ‘6520′;
$month = 2;
$day = 6;
$year = 2007;
printf(”ZIP is %05d and the date is %02d/%02d/%d”, $zip, $month, $day, $year);
显示为:
ZIP is 06520 and the date is 02/06/2007
5.字符格式化-显示符号位
$min = -40;
$max = 40;
printf(”The computer can operate between %+d and %+d degrees Celsius.”, $min, $max);
显示为:
The computer can operate between -40 and +40 degrees Celsius.
6.改变大小写
print strtolower(’Beef, CHICKEN, Pork, duCK’);
print strtoupper(’Beef, CHICKEN, Pork, duCK’);
显示为:
beef, chicken, pork, duck
BEEF, CHICKEN, PORK, DUCK
7.美化姓名(首字符大写)
print ucwords(strtolower(’JOHN FRANKENHEIMER’));
显示为:
John Frankenheimer
8.截取字符
// 截取 $_POST['comments'] 的前30个字符.
print substr($_POST['comments'], 0, 30);
// 加入省略号.
print ‘…’;
如果变量$_POST['comments'] 的值为:
The Fresh Fish with Rice Noodle was delicious, but I didn’t like the Beef Tripe.
将显示为:
The Fresh Fish with Rice Noodl…
9.反向截取字符
print ‘Card: XX’;
print substr($_POST['card'],-4,4);
如果变量$_POST['card']的值为: 4000-1234-5678-9101
将显示为:
Card: XX9101
10.字符替换
print str_replace(’{class}’,$my_class,
‘<span class=”{class}”>Fried Bean Curd</span>
<span class=”{class}”>Oil-Soaked Fish</span>’);
如果变量$my_class 的值为: lunch, 将显示为:
<span class=”lunch”>Fried Bean Curd</span>
<span class=”lunch”>Oil-Soaked Fish</span>
常用作简单的模版处理.
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