Not inserting multiple data using php mysql - php

Question

I have a roles called read,write,and delete operation for a list of menu.I am listing menu with read,write,delete operation with a checkbox to insert to database but when i try to insert its not inserting multiple its inserting has one row in mysql here my code
database
Code
Form.php
<form method="post" action="insertuser.php" class="form-horizontal">
<fieldset>
<div class="form-group">
<label class="col-sm-2 control-label">Username</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="username" id="username" required>
<span class="help-block">Please Enter Username</span>
<span class="help-block" id="name_status"></span>
</div>
</div>
</fieldset>
<fieldset>
<div class="form-group">
<label class="col-sm-2 control-label">Password</label>
<div class="col-sm-10">
<input type="password" class="form-control" name="password" id="password" required>
<span class="help-block">Please Enter Password</span>
</div>
</div>
</fieldset>
<fieldset>
<div class="form-group">
<label class="col-sm-2 control-label">Email Address</label>
<div class="col-sm-10">
<input type="email" class="form-control" name="emailaddress" id="emailaddress" required>
<span class="help-block">Please Enter Email Address</span>
<span class="help-block" id="name_status1"></span>
</div>
</div>
</fieldset>
<fieldset>
<div class="form-group">
<label class="col-sm-2 control-label">Role Name</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="rolename" id="rolename" required>
<span class="help-block">Please Enter Role Name</span>
<span class="help-block" id="name_status2"></span>
</div>
</div>
</fieldset>
<table id="example" class="table table-striped table-bordered" >
<thead>
<th data-field="id" data-sortable="true">Menu Name</th>
<th data-field="name" data-sortable="true">Read</th>
<th data-field="actions" data-sortable="true">Edit</th>
<th data-field="actions" data-sortable="true">Delete</th>
</thead>
<tbody>
<?php
$i=0;
$selectquery=mysql_query("select * from menumanagement");
while($row=mysql_fetch_array($selectquery))
{
?>
<tr>
<td><?php echo $row["mn_menuname"]; ?></td>
<td>
<label class="checkbox checkbox-inline checked">
<span class="icons"><span class="first-icon fa fa-square-o"></span><span class="second-icon fa fa-check-square-o"></span></span><input type="checkbox" name="read1[]" id="read1" value="1_<?php echo $row["mn_id"]; ?>">
</label>
</td>
<td>
<label class="checkbox checkbox-inline checked">
<span class="icons"><span class="first-icon fa fa-square-o"></span><span class="second-icon fa fa-check-square-o"></span></span><input type="checkbox" name="edit1[]" id="edit1" value="1_<?php echo $i."_".$row["mn_id"]; ?>">
</label>
</td>
<td>
<label class="checkbox checkbox-inline checked">
<span class="icons"><span class="first-icon fa fa-square-o"></span><span class="second-icon fa fa-check-square-o"></span></span><input type="checkbox" name="delete1[]" id="delete1" value="1_<?php echo $i."_".$row["mn_id"]; ?>">
</label>
</td>
</tr>
<?php } ?>
</tbody>
</table>
<center><button type="submit" class="btn btn-fill btn-warning btn-wd" id="addmenu">Add User</button></center>
</div>
</form>
Insert.php
<?php
include_once("includes/db.php");
if(!empty($_POST["username"]))
{
$username=$_POST["username"];
}
if(!empty($_POST["password"]))
{
$password=$_POST["password"];
}
if(!empty($_POST["emailaddress"]))
{
$emailaddress=$_POST["emailaddress"];
}
$insertquery=mysql_query("insert into useraccess(useraccess_username,useraccess_password,useraccess_emailaddress) values ('$username','$password','$emailaddress')");
$userid=mysql_insert_id();
if($insertquery)
{
if(empty($_POST["read1"]))
{
$readid=0;
}
if(empty($_POST["edit1"]))
{
$editid=0;
}
if(empty($_POST["delete1"]))
{
$deleteid=0;
}
if($_POST["read1"])
{
$readid="";
$menuid="";
$countread=count($_POST["read1"]);
for($i=0;$i<$countread;$i++)
{
$read1=$_POST["read1"][$i];
$readdiv =explode("_", $read1);
$readid .=$readdiv[0];
$menuid .=$readdiv[1];
}
}
if($_POST["edit1"])
{
$editid="";
$menuid="";
$countedit=count($_POST["edit1"]);
for($i=0;$i<$countedit;$i++)
{
$edit1=$_POST["edit1"][$i];
$editdiv=explode("_", $edit1);
$editid .=$editdiv[0];
$menuid .=$editdiv[1];
}
}
if($_POST["delete1"])
{
$deleteid="";
$menuid="";
$countdelete=count($_POST["delete1"]);
for($i=0;$i<$countdelete;$i++)
{
$delete1=$_POST["delete1"][$i];
$deletediv=explode("_", $delete1);
$deleteid .=$deletediv[0];
$menuid .=$deletediv[1];
}
}
$insertquery1=mysql_query("insert into rolemanagement(menuid,role_read,role_write,role_delete,userid) value ('$menuid','$readid','$editid','$deleteid','$userid')");
if($insertquery1)
{
header('Location: adduser.php?status="Role has been added"');
}
}
?>
Regards