doq70020
2015-05-03 16:27
浏览 34
已采纳

需要检查才能在php中输入浮点数？

I want to validate and that the user only enters float number in the text field such as 3.4. I need to check only the $value1 and $value2 in this case using php.

libraryForm.php

<form action="savelibscores.php" method="POST">
S3: <input class="inputfield" type="text" name="s3" size="5"> <br /><br/>
S4: <input class="inputfield" type="text" name="s4" size="5"> <br /><br/>
<b>Year:<b/>
<select name="year"> 
<option value="Choose">Please select..</option>
<option value="2005">2005</option> 
<option value="2006">2006</option>
<option value="2007">2007</option>
<option value="2008">2008</option>
<option value="2010">2010</option>
<option value="2011">2011</option>
<option value="2012">2012</option></select><br/><br/>

<br/>
<input type="submit" value="Save" name="submit">
<input type="reset" name="reset" value="Clear"><br /><br/>

</form>

savelibscores.php

<?php

 define('DB_NAME','');
 define('DB_USER','');
 define('DB_PASSWORD','');
 define('DB_HOST','localhost');

 $connect = mysql_connect(DB_HOST,DB_USER,DB_PASSWORD);

 if(!$connect){
      die('Could not connect:'.mysql_error());
 }

 $db_selected=mysql_select_db(DB_NAME,$connect);

 if(!$db_selected){
    die('Can\'t use'.DB_NAME.':'.mysql_error());
 }

 if(isset($_POST['submit'])){
    $value1=$_POST['s3'];
    $value2=$_POST['s4'];
   $value3=$_POST['year'];
 if(!empty($value1) && !empty($value2) && !empty($value3)){
       $sql=mysql_query("INSERT INTO `library`(s3,s4,year) VALUES ('".$value1."','".$value2."','".$value3."')")or die(mysql_error());
}
   else{
    echo "Please fill all the fields.";
   }
}
?>

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我想验证并且用户只在文本字段中输入浮点数，例如 3.4 。 在这种情况下，我需要使用 php 检查 $ value1 和 $ value2 。

libraryForm .php 

 ＆lt; form action =“savelibscores.php”method =“POST”＆gt; 
S3：＆lt; input  class =“inputfield”type =“text”name =“s3”size =“5”＆gt;  ＆lt; br /＆gt;＆lt; br /＆gt; 
S4：＆lt; input class =“inputfield”type =“text”name =“s4”size =“5”＆gt;  ＆lt; br /＆gt;＆lt; br /＆gt; 
＆lt; b＆gt;年：＆lt; b /＆gt; 
＆lt; select name =“year”＆gt;  
＆lt; option value =“选择”＆gt;请选择..＆lt; / option＆gt; 
＆lt; option value =“2005”＆gt; 2005＆lt; / option＆gt;  
＆lt; option value =“2006”＆gt; 2006＆lt; / option＆gt; 
＆lt; option value =“2007”＆gt; 2007＆lt; / option＆gt; 
＆lt; option value =“2008”＆gt; 2008＆lt; / option＆gt; 
＆lt;  ; option value =“2010”＆gt; 2010＆lt; / option＆gt; 
＆lt; option value =“2011”＆gt; 2011＆lt; / option＆gt; 
＆lt; option value =“2012”＆gt; 2012＆lt; / option＆gt;＆lt; / select＆gt  ;＆lt; br /＆gt;＆lt; br /＆gt; 
 
＆lt; br /＆gt; 
＆lt; input type =“submit”value =“保存”name =“submit”＆gt; 
＆lt; input type =“ 重置“name =”reset“value =”清除“＆gt;＆lt; br /＆gt;＆lt; br /＆gt; 
 
＆lt; / form＆gt; 
   
 
 
 savelibscores.php  
 
 
 ＆lt;？php 
 
define（'DB_NAME'，''）; 
 define（'DB_USER'，''）; 
  define（'DB_PASSWORD'，''）; 
 define（'DB_HOST'，'localhost'）; 
 
 $ connect = mysql_connect（DB_HOST，DB_USER，DB_PASSWORD）; 
 
 if（！$ connect）{  
 die（'无法连接：'。mysql_error（））; 
} 
 
 $ db_selected = mysql_select_db（DB_NAME，$ connect）; 
 
 if if（！$ db_selected）{
 die（' 不能使用'.DB_NAME。'：'。mysql_error（））; 
} 
 
 if（isset（$ _ POST ['submit']））{
 $ value1 = $ _ POST ['s3'  ]; 
 $ value2  = $ _ POST ['s4']; 
 $ value3 = $ _ POST ['year']; 
 if（！empty（$ value1）＆amp;＆amp;  ！empty（$ value2）＆amp;＆amp;  ！empty（$ value3））{
 $ sql = mysql_query（“INSERT INTO` library`（s3，s4，year）VALUES（'”。$ value1。“'，'”。$ value2。“'，'”  。$ value3。“'）”）或死（mysql_error（））; 
} 
其他{
 echo“请填写所有字段。”; 
} 
} 
？＆gt; 
 <  / code>
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2条回答 默认 最新

  • dtdsbakn210537 2015-05-03 17:11
    已采纳

    You have a couple of options ..

    is_float() function

    filter_var() function, with the FILTER_VALIDATE_FLOAT filter as second argument.

    floatval() or the (float) cast before your variable name.

    The first two will check wether or not it's a float, and the third one will convert whatever you give it to a float. I like to use the filter_var() function as it makes the code clear, and it,s also very useful to verify all sort of things (emails adress, IP adress, URL, etc).

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