我无法找到null错误，但代码是正确的，就像HTML表单中的每个字段都有自己的名称，在PHP代码中写得正确
这是我的表单代码:<html>
<body>
<center>
<form class="form-horizontal" method="POST" action="register.php">
<h2><strong>Entry Form</strong></h2>
<table>
<tr>
<td> </td>
</tr>
<tr>
<td>Directory</td>
<td><input type='text' class="form-control" id='username' name='directoryname'></td>
<td><input type='button' style="margin-left:10px;" class="btn btn-default" id='check_username_availability' value='Check Directory'></td>
<td> </td>
<td><div id='username_availability_result'></div></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>Machine IP</td>
<td><input type='text' class="form-control" id='machinename' name='machineip' ></td>
<td><input type='button' style="margin-left:10px;" class="btn btn-default" id='check_machine_ip' value='Check IP Address' ></td>
<td> </td>
<td><div id="machine_ip_result"></div></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>Description</td>
<td><input type='text' class="form-control" onkeyup="checkdescriptionwords(this)" name="description" id='description'></td>
<td><div id="description_result"></div></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>State</td>
<td>
<select id="state" name="state" class="form-control">
<option value="">Select State</option>
<option value="andaman-nicobar-map">Andaman-Nicobar</option>
<option value="andhra-pradesh-map">Andhra-Pradesh</option>
<option value="arunachal-map">Arunachal</option>
<option value="assam-map">Assam</option>
<option value="bihar-map">Bihar</option>
<option value="chandigarh-map">Chandigarh</option>
<option value="chattisgarh-map">Chattisgarh</option>
<option value="daman-map">Daman</option>
<option value="delhi-map">Delhi</option>
<option value="goa-map">Goa</option>
<option value="gujarat-map">Gujarat</option>
<option value="haryana-map">Haryana</option>
<option value="himachal-pradesh-map">Himachal-Pradesh</option>
<option value="jammu-kashmir-map">Jammu-Kashmir</option>
<option value="jharkhand-map">Jharkhand</option>
<option value="karnataka-map">Karnataka</option>
<option value="kerala-map">Kerala</option>
<option value="lakshadweep-map">Lakshadweep</option>
<option value="madhya-pradesh-map">Madhya-Pradesh</option>
<option value="maharashtra-map">Maharashtra</option>
<option value="manipur-map">Manipur</option>
<option value="meghalaya-map">Meghalaya</option>
<option value="mizoram-map">Mizoram</option>
<option value="nagaland-map">Nagaland</option>
<option value="orissa-map">Orissa</option>
<option value="pondichery-map">Pondichery</option>
<option value="punjab-map">Punjab</option>
<option value="rajasthan-map">Rajasthan</option>
<option value="sikkim-map">Sikkim</option>
<option value="tamilnadu-map">Tamilnadu</option>
<option value="telangana-map">Telangana</option>
<option value="tripura-map">Tripura</option>
<option value="uttarnchal-map">Uttarnchal</option>
<option value="uttar-pradesh-map">Uttar-Pradesh</option>
<option value="west-bengal-map">West Bengal</option>
</select>
</td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>Link Status</td>
<td>
<select id="linkstatus" name="status" class="form-control">
<option value="">Select Link Status</option>
<option value="y">Yes</option>
<option value="n">No</option>
</select>
</td>
</tr>
<tr><td> </td></tr>
<tr>
<td>Institute ID</td>
<td><input type="text" class="form-control" name="institueid" id="institueid" maxlength="4" onkeypress="return isNumber(event)"/></td>
<td><div id="institute_id_result"></div></td>
</tr>
<tr><td> </td></tr>
<tr>
<td>Category</td>
<td>
<select class="form-control" id="category" name="category">
<option selected="">Select Category</option>
<option value="cate-1g">1g</option>
<option value="cate-army">army</option>
<option value="cate-artd">artd</option>
<option value="cate-ayush">ayush</option>
<option value="cate-bhawan">bhawan</option>
<option value="cate-budget">budget</option>
<option value="cate-cdac">cdac</option>
<option value="cate-cdot">cdot</option>
<option value="cate-central">central</option>
<option value="cate-cooperative">cooperative</option>
<option value="cate-core">core</option>
<option value="cate-csir">csir</option>
<option value="cate-dae">dae</option>
<option value="cate-dbt">dbt</option>
<option value="cate-deemed-uni">deemed-uni</option>
<option value="cate-dir">dir</option>
<option value="cate-dir-list">dir-list</option>
<option value="cate-drdo">drdo</option>
<option value="cate-dst">dst</option>
<option value="cate-engineering">engineering</option>
<option value="cate-ernet">ernet</option>
<option value="cate-exbackup.html">exbackup.html</option>
<option value="cate-ex.html">ex.html</option>
<option value="cate-icar">icar</option>
<option value="cate-icfre">icfre</option>
<option value="cate-icmr">icmr</option>
<option value="cate-iiit">iiit</option>
<option value="cate-iim">iim</option>
<option value="cate-iiser">iiser</option>
<option value="cate-iit">iit</option>
<option value="cate-isi">isi</option>
<option value="cate-isro">isro</option>
<option value="cate-library">library</option>
<option value="cate-management">management</option>
<option value="cate-mass">mass</option>
<option value="cate-media">media</option>
<option value="cate-medical">medical</option>
<option value="cate-moes">moes</option>
<option value="cate-mop">mop</option>
<option value="cate-nadt">nadt</option>
<option value="cate-navy">navy</option>
<option value="cate-ncert">ncert</option>
<option value="cate-ncte">ncte</option>
<option value="cate-nid">nid</option>
<option value="cate-nielit">nielit</option>
<option value="cate-nift">nift</option>
<option value="cate-niper">niper</option>
<option value="cate-nit">nit</option>
<option value="cate-npti">npti</option>
<option value="cate-ntro">ntro</option>
<option value="cate-others">others</option>
<option value="cate-police">police</option>
<option value="cate-pragati">pragati</option>
<option value="cate-puni">puni</option>
<option value="cate-rbi">rbi</option>
<option value="cate-rese">rese</option>
<option value="cate-sau">sau</option>
<option value="cate-sdc">sdc</option>
<option value="cate-stqc">stqc</option>
<option value="cate-suni">suni</option>
<option value="cate-swan">swan</option>
<option value="cate-ugc">ugc</option>
<option value="cate-wifi">wifi</option>
<option value="cate-wifideity">wifideity</option>
<option value="cate-wifiindirab">wifiindirab</option>
<option value="cate-wifimofnb">wifimofnb</option>
<option value="cate-wifinirman">wifinirman</option>
<option value="cate-wifiparlspek">wifiparlspek</option>
<option value="cate-wifipresidenth">wifipresidenth</option>
<option value="cate-wifirajivgb">wifirajivgb</option>
<option value="cate-wifishastri">wifishastri</option>
<option value="cate-wifishram">wifishram</option>
<option value="cate-wifitech">wifitech</option>
<option value="cate-wifitransport">wifitransport</option>
<option value="cate-wifiudyog">wifiudyog</option>
<option value="cate-wifivigyan">wifivigyan</option>
<option value="cate-wifiyojana">wifiyojana</option>
</select>
</td>
</tr>
<tr><td> </td></tr>
<tr>
<td>Service Provider</td>
<td>
<select class="form-control" id="provider" name="provider">
<option selected="">Select Provider</option>
<option value="MTNL">MTNL</option>
<option value="NKN">NKN</option>
<option value="BSNL">BSNL</option>
<option value="PGCIL">PGCIL</option>
<option value="RAILTEL">RAILTEL</option>
<option value="INTERNAL">INTERNAL</option>
</select>
</td>
</tr>
<tr><td> </td></tr>
<tr>
<td>Project</td>
<td>
<select class="form-control" id="project" name="project">
<option selected="">Select Project</option>
<option value="NKN">NKN</option>
<option value="NMEICT">NMEICT</option>
<option value="Z1G">DIST-NKN</option>
<option value="Z1GNIC">DIST-NIC</option>
<option value="CORE">CORE</option>
<option value="FW">FIREWALL</option>
<option value="BHAWAN">BHAWAN</option>
<option value="WIFI">WIFI</option>
<option value="PRAGATI">PRAGATI</option>
</select>
</td>
</tr>
<tr><td> </td></tr>
</table>
<button type="button" class="btn btn-warning" id="validate">Validate</button>
<button type="submit" class="btn btn-success" id="register">Register</button>
<button type="button" class="btn btn-default">Home</button>
</form>
</center>
</body>
</html>
这是我的php代码:PHP代码没有从表单数据或文本框
中获取任何值<?php
$directoryName=$_POST['directoryname'];
$ipaddress=$_POST['ipaddress'];
$description=$_POST['description'];
$state=$_POST['state'];
$status=$_POST['status'];
$instituteid=$_POST['institueid'];
$provider=$_POST['provider'];
$category=$_POST['category'];
$project=$_POST['project'];
$resulting=0;
$query="INSERT INTO data (`directory`,`machineip`,`description`,`state`,`status`,`instituteid`,`provider`,`category`,`project`) VALUES ('$directoryName','$ipaddress','$description','$state','$status','$instituteid','$provider','$category','$project')";
if(@mysql_connect('localhost','root','')){
if(@mysql_select_db('username')){
if(strlen($instituteid) == 1){
$instituteid="000".$instituteid;
}
if(strlen($instituteid) == 2){
$instituteid="00".$instituteid;
}
if(strlen($instituteid) == 3){
$instituteid="0".$instituteid;
}
if(strlen($instituteid) == 4){
$instituteid=$instituteid;
}
$query="INSERT INTO data (`directory`,`machineip`,`description`,`state`,`status`,`instituteid`,`provider`,`category`,`project`) VALUES ('$directoryName','$ipaddress','$description','$state','$status','$instituteid','$provider','$category','$project')";
if($result=@mysql_query($query)){
$newfile=fopen('datasave.txt','a');
$data=$directoryName.":".$ipaddress.":".$description.":".$state.":".$status.":".$instituteid.":".$category.":".$project."'r'n";
fwrite($newfile,$data);
fclose($newfile);
$resulting=1;
/*echo '<body><div class="container"><div class="container-fluid"><center><div class="alert alert-success" style="margin-top:45px;">Data Saved <strong>Successfully</strong></div></center></div></div></body>';>
header( "refresh:3; url=index.php" );*/
}
}
}
if($resulting == 1){
echo 1;
}else{
echo 0;
}
?>
$_POST['state']为空，因为没有提交state下拉列表的值(或者表单中没有选择选项)
执行var_dump($_POST)以查看和测试脚本接收到的输入