<?php
        $servername = "localhost";
        $username = "root";
        $password = "";
        $dbname = "candidatesList";
        //create connection
        $conn = mysqli_connect($servername, $username, $password,$dbname);
        // Check connection
        if (!$conn) {
            die("Connection failed: " . mysqli_connect_error());
        }
//        $sql = "INSERT INTO candidatesListFields (Sourcing_HR, DOS, Candidate_Name, Total_Experience, Current_CTC, Expected_CTC, Current_Location, Preferred_Location) VALUES ('', '', '', '', '', '','','')";
    ?>
</head>
<body>
    <div class="container-fluid">
        <div class="row">
            <div class="col-xs-12 header">
                <h3 class="pull-left">Track your Candidates</h3>
                <button type="button" class="pull-right btn btn-primary exportBtn" data-toggle="modal" data-target=".exportTable"><i class="glyphicon glyphicon-save saveIcon"></i> Export to Excel</button>
                <div class="clear"></div>
            </div>
            <div class="col-xs-12">
                <div class="col-lg-12 formWrapper">
                    <form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="sourcingHR">Sourcing HR</label>
                            <input type="text" class="form-control" id="sourcingHR" value="<?php echo $Sourcing_HR;?>" name="Sourcing_HR" placeholder="Sourcing HR">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="dateOfSourcing">Date of Sourcing</label>
                            <input type="text" class="form-control" id="dateOfSourcing" name="DOS" placeholder="Date of sourcing">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="candidateName">Candidate Name</label>
                            <input type="text" class="form-control" id="candidateName" name="Candidate_Name" placeholder="Candidate Name">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="totalExperience">Total Experience</label>
                            <input type="text" class="form-control" id="totalExperience" name="Total_Experience" placeholder="Total Experience">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="currCTC">Curr. CTC</label>
                            <input type="text" class="form-control" id="currCTC" name="Current_CTC" placeholder="Current CTC">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="expCTC">Exp. CTC</label>
                            <input type="text" class="form-control" id="expCTC" name="Expected_CTC" placeholder="Expected CTC">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="currLocation">Current Location</label>
                            <input type="text" class="form-control" id="currLocation" name="Current_Location" placeholder="Current Location">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="prefLocation">Preferred Location</label>
                            <input type="text" class="form-control" id="prefLocation" name="Preferred_Location" placeholder="Preferred Location">
                        </div>
                        <div class="form-group col-xs-12 text-right">
                            <button class="btn btn-success" type="submit">
                                <i class="glyphicon glyphicon-floppy-disk saveIcon"></i> Save
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
Here I have created Data base and now I want to save values into the database for the following fields but it is giving undefined index. what can I do for this.
        if(!empty($_POST['Sourcing_HR'] AND $_POST['DOS'] AND $_POST['Candidate_Name'] AND $_POST['Candidate_Name'] AND $_POST['Total_Experience'] AND $_POST['Current_CTC'] AND $_POST['Expected_CTC'] AND $_POST['Current_Location'] AND $_POST['Preferred_Location'])){
            $sql = "INSERT INTO candidatesListFields (Sourcing_HR, DOS, Candidate_Name, Total_Experience, Current_CTC, Expected_CTC, Current_Location, Preferred_Location) VALUES ('$Sourcing_HR', '$DOS', '$Candidate_Name', '$Total_Experience', '$Current_CTC', '$Expected_CTC','$Current_Location','$Preferred_Location')";
            echo($_POST[$Sourcing_HR.' '. $DOS.' '. $Candidate_Name.' '. $Total_Experience.' '. $Current_CTC.' '. $Expected_CTC.' '. $Current_Location.' '. $Preferred_Location]);
        }
        if (isset($_POST['Sourcing_HR'])) {
            $Sourcing_HR = $_POST['Sourcing_HR'];
        }
    ?>
This is not working properly please help if anyone out there*
 <?php
        $servername = "localhost";
        $username = "root";
        $password = "";
        $dbname = "candidatesList";
        //create connection
        $conn = mysqli_connect($servername, $username, $password,$dbname);
        // Check connection
        if (!$conn) {
            die("Connection failed: " . mysqli_connect_error());
        }
//        $sql = "INSERT INTO candidatesListFields (Sourcing_HR, DOS, Candidate_Name, Total_Experience, Current_CTC, Expected_CTC, Current_Location, Preferred_Location) VALUES ('', '', '', '', '', '','','')";
    ?>
    
    <?php
        $sql = "INSERT INTO candidatesListFields (Sourcing_HR, DOS, Candidate_Name, Total_Experience, Current_CTC, Expected_CTC, Current_Location, Preferred_Location) VALUES ('', '', '', '', '', '','','')";
        // getting values of input fields from form
        $Sourcing_HR = mysqli_real_escape_string($conn,$_POST['Sourcing_HR']);
        $DOS = mysqli_real_escape_string($conn,$_POST['DOS']); 
        $Candidate_Name = mysqli_real_escape_string($conn,$_POST['Candidate_Name']); 
        $Total_Experience = mysqli_real_escape_string($conn,$_POST['Total_Experience']);
        $Current_CTC = mysqli_real_escape_string($conn,$_POST['Current_CTC']);
        $Expected_CTC = mysqli_real_escape_string($conn,$_POST['Expected_CTC']);
        $Current_Location = mysqli_real_escape_string($conn,$_POST['Current_Location']);
        $Preferred_Location = mysqli_real_escape_string($conn,$_POST['Preferred_Location']);
    
        if(!empty($_POST['Sourcing_HR'] AND $_POST['DOS'] AND $_POST['Candidate_Name'] AND $_POST['Candidate_Name'] AND $_POST['Total_Experience'] AND $_POST['Current_CTC'] AND $_POST['Expected_CTC'] AND $_POST['Current_Location'] AND $_POST['Preferred_Location'])){
            $sql = "INSERT INTO candidatesListFields (Sourcing_HR, DOS, Candidate_Name, Total_Experience, Current_CTC, Expected_CTC, Current_Location, Preferred_Location) VALUES ('$Sourcing_HR', '$DOS', '$Candidate_Name', '$Total_Experience', '$Current_CTC', '$Expected_CTC','$Current_Location','$Preferred_Location')";
            echo($_POST[$Sourcing_HR.' '. $DOS.' '. $Candidate_Name.' '. $Total_Experience.' '. $Current_CTC.' '. $Expected_CTC.' '. $Current_Location.' '. $Preferred_Location]);
        }
    
        if (isset($_POST['Sourcing_HR'])) {
            $Sourcing_HR = $_POST['Sourcing_HR'];
        }
        
    ?></head>
<body>
    <div class="container-fluid">
        <div class="row">
            <div class="col-xs-12 header">
                <h3 class="pull-left">Track your Candidates</h3>
                <button type="button" class="pull-right btn btn-primary exportBtn" data-toggle="modal" data-target=".exportTable"><i class="glyphicon glyphicon-save saveIcon"></i> Export to Excel</button>
                <div class="clear"></div>
            </div>
            <div class="col-xs-12">
                <div class="col-lg-12 formWrapper">
                    <form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="sourcingHR">Sourcing HR</label>
                            <input type="text" class="form-control" id="sourcingHR" value="<?php echo $Sourcing_HR;?>" name="Sourcing_HR" placeholder="Sourcing HR">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="dateOfSourcing">Date of Sourcing</label>
                            <input type="text" class="form-control" id="dateOfSourcing" name="DOS" placeholder="Date of sourcing">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="candidateName">Candidate Name</label>
                            <input type="text" class="form-control" id="candidateName" name="Candidate_Name" placeholder="Candidate Name">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="totalExperience">Total Experience</label>
                            <input type="text" class="form-control" id="totalExperience" name="Total_Experience" placeholder="Total Experience">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="currCTC">Curr. CTC</label>
                            <input type="text" class="form-control" id="currCTC" name="Current_CTC" placeholder="Current CTC">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="expCTC">Exp. CTC</label>
                            <input type="text" class="form-control" id="expCTC" name="Expected_CTC" placeholder="Expected CTC">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="currLocation">Current Location</label>
                            <input type="text" class="form-control" id="currLocation" name="Current_Location" placeholder="Current Location">
                        </div>
                        <div class="form-group col-xs-12 col-md-3">
                            <label for="prefLocation">Preferred Location</label>
                            <input type="text" class="form-control" id="prefLocation" name="Preferred_Location" placeholder="Preferred Location">
                        </div>
                        <div class="form-group col-xs-12 text-right">
                            <button class="btn btn-success" type="submit">
                                <i class="glyphicon glyphicon-floppy-disk saveIcon"></i> Save
                            </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
    *
 
     
     
    