php非空验证
我想说这种方法是不是很常用的非空验证，现在的普遍使用的是javascript来验证非空，但是作为学习php的一些知识点，还是可以看看的。 先来看看commit.php中的方法 ? php $db = mysql_connect ('localhost','root','Ctrip07185419' ); mysql_select_db ('movie
我想说这种方法是不是很常用的非空验证，现在的普遍使用的是javascript来验证非空，但是作为学习php的一些知识点，还是可以看看的。
先来看看commit.php中的方法
<span>php
</span><span>$db</span> = <span>mysql_connect</span>('localhost','root','Ctrip07185419'<span>);
</span><span>mysql_select_db</span>('moviesite',<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>));
</span><span>mysql_query</span>('set names "gb2312"',<span>$db</span><span>);
</span>?>
<!--
<html>
<head></head>
<title>Commit</title>
<body>
-->
<span>php
</span><span>switch</span>(<span>$_GET</span>['action'<span>])
{
</span><span>case</span> "add":<span>
{
</span><span>switch</span>(<span>$_GET</span>['type'<span>])
{
</span><span>case</span> 'movie':
<span>$error</span> = <span>array</span><span>();
</span><span>$movie_name</span> = <span>isset</span>(<span>$_POST</span>['movie_name']) ? <span>trim</span>(<span>$_POST</span>['movie_name']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_name</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter an movie name'<span>);
}
</span><span>$movie_type</span> = <span>isset</span>(<span>$_POST</span>['movie_type']) ? <span>trim</span>(<span>$_POST</span>['movie_type']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_type</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie type'<span>);
}
</span><span>$movie_year</span> = <span>isset</span>(<span>$_POST</span>['movie_year']) ? <span>trim</span>(<span>$_POST</span>['movie_year']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_year</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie year'<span>);
}
</span><span>$movie_leadactor</span> = <span>isset</span>(<span>$_POST</span>['movie_leadactor']) ? <span>trim</span>(<span>$_POST</span>['movie_leadactor']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_leadactor</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie leadactor'<span>);
}
</span><span>$movie_director</span> = <span>isset</span>(<span>$_POST</span>['movie_director']) ? <span>trim</span>(<span>$_POST</span>['movie_director']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_director</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie director'<span>);
}
</span><span>$movie_release</span> = <span>isset</span>(<span>$_POST</span>['movie_release']) ? <span>trim</span>(<span>$_POST</span>['movie_release']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_release</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie release'<span>);
}
</span><span>else</span> <span>if</span>(!<span>preg_match</span>('|^\d{2}-\d{2}-\d{4}$|' , <span>$movie_release</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a date in dd-mm-yyyy format'<span>);
}
</span><span>else</span><span>
{
</span><span>list</span>(<span>$day</span>, <span>$month</span>, <span>$year</span>) = <span>explode</span>('-', <span>$movie_release</span><span>);
</span><span>if</span>(!<span>checkdate</span>(<span>$month</span> , <span>$day</span> , <span>$year</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('please enter a validate date'<span>);
}
</span><span>else</span><span>
{
</span><span>$movie_release</span> = <span>mktime</span>(0, 0, 0, <span>$month</span>, <span>$day</span>, <span>$year</span><span>);
}
}
</span><span>$movie_rating</span> = <span>isset</span>(<span>$_POST</span>['movie_rating']) ? <span>trim</span>(<span>$_POST</span>['movie_rating']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_rating</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie leadactor'<span>);
}
</span><span>else</span> <span>if</span>(!<span>is_numeric</span>(<span>$movie_rating</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a numeric rating'<span>);
}
</span><span>else</span> <span>if</span>(<span>$movie_rating</span> $movie_rating > 10<span>)
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a rating between 1 and 10'<span>);
}
</span><span>if</span>(<span>empty</span>(<span>$error</span><span>))
{
</span><span>//</span><span>var_dump($movie_rating);
//注意是movie_type不是mvioe_type，大错特错</span>
<span>$query</span> = '<span>insert into movie(movie_name,movie_year,movie_type,movie_leadactor,movie_director,movie_release,movie_rating)
values("</span>'.<span>$movie_name</span>.'",'.<span>$movie_year</span>.','.<span>$movie_type</span>.','.<span>$movie_leadactor</span>.','.<span>$movie_director</span>.','.<span>$movie_release</span>.','.<span>$movie_rating</span>.')'<span>;
}
</span><span>else</span><span>
{
</span><span>//</span><span>注意是Location不是Lacotion，大错特错</span>
<span>header</span>('Location:movie_checkformat.php?action=add&error=' . <span>join</span>(<span>$error</span> , <span>urlencode</span>('<br>'<span>)));
</span><span>//</span><span>var_dump($error);
//var_dump($_POST);</span>
<span> }
</span><span>break</span><span>;
}
</span><span>break</span><span>;
}
</span><span>case</span> 'edit':
<span>switch</span>(<span>$_GET</span>['type'<span>])
{
</span><span>case</span> 'movie':<span>
{
</span><span>$error</span> = <span>array</span><span>();
</span><span>$movie_name</span> = <span>isset</span>(<span>$_POST</span>['movie_name']) ? <span>trim</span>(<span>$_POST</span>['movie_name']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_name</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter an movie name'<span>);
}
</span><span>$movie_type</span> = <span>isset</span>(<span>$_POST</span>['movie_type']) ? <span>trim</span>(<span>$_POST</span>['movie_type']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_type</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie type'<span>);
}
</span><span>$movie_year</span> = <span>isset</span>(<span>$_POST</span>['movie_year']) ? <span>trim</span>(<span>$_POST</span>['movie_year']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_year</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie year'<span>);
}
</span><span>$movie_leadactor</span> = <span>isset</span>(<span>$_POST</span>['movie_leadactor']) ? <span>trim</span>(<span>$_POST</span>['movie_leadactor']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_leadactor</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie leadactor'<span>);
}
</span><span>$movie_director</span> = <span>isset</span>(<span>$_POST</span>['movie_director']) ? <span>trim</span>(<span>$_POST</span>['movie_director']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_director</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie director'<span>);
}
</span><span>$movie_release</span> = <span>isset</span>(<span>$_POST</span>['movie_release']) ? <span>trim</span>(<span>$_POST</span>['movie_release']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_release</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie release'<span>);
}
</span><span>else</span> <span>if</span>(!<span>preg_match</span>('|^\d{2}-\d{2}-\d{4}$|' , <span>$movie_release</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a date in dd-mm-yyyy format'<span>);
}
</span><span>else</span><span>
{
</span><span>list</span>(<span>$day</span>, <span>$month</span>, <span>$year</span>) = <span>explode</span>('-', <span>$movie_release</span><span>);
</span><span>if</span>(!<span>checkdate</span>(<span>$month</span> , <span>$day</span> , <span>$year</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('please enter a validate date'<span>);
}
</span><span>else</span><span>
{
</span><span>$movie_release</span> = <span>mktime</span>(0, 0, 0, <span>$month</span>, <span>$day</span>, <span>$year</span><span>);
}
}
</span><span>$movie_rating</span> = <span>isset</span>(<span>$_POST</span>['movie_rating']) ? <span>trim</span>(<span>$_POST</span>['movie_rating']) : ''<span>;
</span><span>if</span>(<span>empty</span>(<span>$movie_rating</span><span>))
{
</span><span>$error</span>[] = <span>urldecode</span>('Please enter an movie leadactor'<span>);
}
</span><span>else</span> <span>if</span>(!<span>is_numeric</span>(<span>$movie_rating</span><span>))
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a numeric rating'<span>);
}
</span><span>else</span> <span>if</span>(<span>$movie_rating</span> $movie_rating > 10<span>)
{
</span><span>$error</span>[] = <span>urlencode</span>('Please enter a rating between 1 and 10'<span>);
}
</span><span>if</span>(<span>empty</span>(<span>$error</span><span>))
{
</span><span>//</span><span>var_dump($_POST);</span>
<span>$query</span> = '<span>update movie set
movie_name="</span>'.<span>$_POST</span>['movie_name'].'<span>",
movie_type=</span>'.<span>$_POST</span>['movie_type'].'<span>,
movie_year=</span>'.<span>$_POST</span>['movie_year'].'<span>,
movie_leadactor=</span>'.<span>$_POST</span>['movie_leadactor'].'<span>,
movie_director=</span>'.<span>$_POST</span>['movie_director']. '<span>
movie_release=</span>'.<span>$_POST</span>['movie_release'].'<span>
movie_rating=</span>'.<span>$_POST</span>['movie_rating'].'<span>
where movie_id=</span>'.<span>$_POST</span>['movie_id'<span>];
}
</span><span>else</span><span>
{
</span><span>//</span><span>注意是Location不是Lacotion，大错特错</span>
<span>header</span>('Location:movie_checkformat.php?action=add&error=' . <span>join</span>(<span>$error</span> , <span>urlencode</span>('<br>'<span>)));
}
}
</span><span>break</span><span>;
}
</span><span>break</span><span>;
</span><span>default</span>:
<span>break</span><span>;
}
</span><span>if</span>(<span>isset</span>(<span>$query</span><span>))
{
</span><span>mysql_query</span>(<span>$query</span>,<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>));
}
</span>?>
<title>Commit</title>
<p><span>Done</span>!</p>
其实逻辑很简答的，看下面的代码
$movie_leadactor = isset($_POST['movie_leadactor']) ? trim($_POST['movie_leadactor']) : '';
if(empty($movie_leadactor))
{
$error[] = urldecode('Please enter an movie leadactor');
}
其实就是使用isset方法来验证输入是否为空，如果是空的话把错误信息记入到一个数组$error中，然后使用header方法跳转到填写信息的页面中，跳转的方法看上去有点糟糕，如下header('Location:movie_checkformat.php?action=add&error=' . join($error , urlencode('
')));，是将所有错误信息使用换行符来连接起来放到url中来跳转，很我觉得这个有点不合适的。
来看填写信息的页面movie_checkformat.php，
<span>php
</span><span>$db</span> = <span>mysql_connect</span>('localhost','root','Ctrip07185419') or <span>die</span>('can not connect to mysql'<span>);
</span><span>mysql_select_db</span>('moviesite',<span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>));
</span><span>mysql_query</span>('set names gbk',<span>$db</span><span>);
</span><span>if</span>(<span>isset</span>(<span>$_GET</span>['action']) && <span>$_GET</span>['action'] == 'edit'<span>)
{
</span><span>$query</span> = 'SELECT movie_name,movie_type,movie_year,movie_leadactor,movie_director,movie_release,movie_rating FROM movie WHERE movie_id='.<span>$_GET</span>['id'<span>];
</span><span>//</span><span>echo $query;</span>
<span>$result</span> = <span>mysql_query</span>(<span>$query</span> , <span>$db</span>) or <span>die</span>(<span>mysql_error</span>(<span>$db</span><span>));
</span><span>extract</span>(<span>mysql_fetch_assoc</span>(<span>$result</span><span>));
}
</span><span>else</span><span>
{
</span><span>$movie_name</span>=''<span>;
</span><span>$movie_type</span>=0<span>;
</span><span>$movie_year</span>=<span>date</span>('Y'<span>);
</span><span>$movie_leadactor</span>=0<span>;
</span><span>$movie_director</span>=0<span>;
</span><span>$movie_release</span>=<span>time</span><span>();
</span><span>$movie_rating</span>=5<span>;
}
</span>?>
<title>
<?php <span>echo <span>ucfirst</span>(<span>$_GET</span>['action']);?> Movie</title>
<style type="text/css">
<!--
<span>#<span>error { background-color: #600; border: 1px solid #FF0; color: #FFF; text-align: center; margin: 10px; padding: 10px; }
-->
</style>
<span>php
</span><span>if</span>(<span>isset</span>(<span>$_GET</span>['error']) && <span>$_GET</span>['error'] != ''<span>)
{
</span><span>echo</span> '<div id="error">'.<span>$_GET</span>['error'].'</div>'<span>;
}
</span>?>
在html中的body开始的时候如果传递的error参数不为空则输出错误信息，代码如下：
if(isset($_GET['error']) && $_GET['error'] != '')
{
echo '
}
?>
很简单，这种写法也很糟糕，完全可以放在javascript中来实现，估计实际生产中很少会有人这么写的。
这里顺便看看一些常见的判断方法：
is_array()：判断变量是否是一个数组
is_binary()： 判断变量是否是一个二进制串
is_bool()：判断布尔类型变量true还是false，1还是0
is_callable(): 判断变量是否是一个可以访问的函数，估计就是判断是否是代理类型
is_int(): 判断整型
is_null(): 判断是否为空
is_numeric():判断是否是数字或者数字形式的字符串吧
is_object(): 判断变量是否是一个对象
is_resource(): 判断资源类型
is_string(): 判断是否是字符串类型
is_unicode(): 判断是否是unicode字符串
某些时候使用is_xx方法比较慢，使用ctype_xx类型的方法较快，但是它只能检验字符串类型，不能检验对象，数组，资源类型。ctype_xx方法举例如下：
ctype_alnum(): 判断变量是否是数字类型字符串
ctype_alpha(): 判断变量全是字符串
ctype_cntrl(): 判断是控制字符，就是转移字符如"\n"
ctype_digit(): 判断字符串全部是数字字符，不包含任何非数组字符"."这样的也不包含
ctype_graph(): 检查是否有任何可打印字符，除了空格（补）
ctype_lower() : 检查小写字母
ctype_print(): 检查是否都是可打印字符，就是不包含转移字符，和ctype_control()是相斥的
ctype_punct(): 检查是否有任何可打印字符而不是空格或字母数字字符
ctype_space(): 检查是否都是空白字符
ctype_upper() : 检查是否都是大写字符
ctype_xdigit(): 检查是否是16进制的字符串，只能包括 “0123456789abcdef”
还可以使用preg_match来检验输入，这个是用正则表达式的方式来进行检验的。
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