I have searched on the above topic and found various answers but didn't help me out
whenever I post a date on from ny web form, the result on my table is always 0000-00-00
I have been at this for 2 days and tried all suggestions i found but to no avail. i am sure i'm missing a very tiny detail. here are my codes:
<html>
<head>
<meta charset="utf-8">
<title>IBADAM BMs</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.3/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.3/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
$(function() {
$("#datepicker").datepicker({dateFormat: 'yy-mm-dd'});
});
</script>
</head>
<body bgcolor="#E6E6FA">
<br>
<div>
<div style="float: left; margin-left: 340px;>
<img src="../image/banner.png" alt="" align=""/>
</div>
<br><br><br><br><br>
<div style="float: left; margin-left: 1100px; margin-top: 0px;">
Log out
</div>
<br><br>
<center><b><h3>DIVISION</h3></b></center>
<?php
error_reporting (E_ALL ^ (E_NOTICE + E_WARNING));
$con=mysqli_connect("localhost","alagbeco","a12345","alagbeco_modem");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
if(!isset($_POST['submit'])) {
?>
<center>
<form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
<br><br>
Branch:
<select name="branch">
<option></option>
<option>DIVINE</option>
<option>GLORY 1</option>
<option>GLORY 2</option>
</select>
<br><br>
Date:
<input type="text" name="datepicker" id="datepicker">
<br><br>
Amount:
<input type="text" name="amount">
<br><br>
<input type="submit" name = "submit" value ="Process">
</form>
</center>
<?php
} else {
// escape variables for security
$branch = $_POST['branch'];
$amount = $_POST['amount'];
$datepicker = $_POST['date'];
//check for existence
$check_sql = "SELECT count(no) FROM bm_ibadan_division WHERE branch= '$branch' AND date = '$datepicker'";
$check = mysqli_query($con,$check_sql);
while ($check_rsult = mysqli_fetch_array($check)) {
$count = $check_rsult['count(no)'];
if($count >0 ) {
die ("Double treatment not allowed");
} else {
//insert into table
$sql = "INSERT INTO bm_ibadan_division (branch, status, amount, date)
VALUES ('$branch', 'Reconciled', '$amount', '$datepicker')";
$result = mysqli_query($con, $sql);
} echo '<br><br><center>Entry Successful</center><br><br>';
}
}
?>
<br>
</body>
</html>
Formate should be yy-mm-dd.Try like this:
<script>
$(function() {
$("#datepicker").datepicker({dateFormat: 'yy-mm-dd'});
});
</script>
also change: $datepicker = $_POST['date']; to $datepicker = $_POST['datepicker'];
date format has to be YYYY-MM-DD
<script>
$(function() {
$("#datepicker").datepicker({dateFormat: 'yyyy-mm-dd'});
});
</script>
Either change this
<input type="text" name="datepicker" id="datepicker">
to
<input type="text" name="date" id="datepicker">
OR
Change
$_POST['date']
to
$_POST['datepicker']
In your php code
$datepicker=$_POST['date'] like this.
Please Change to $_POST['datepicker']. Then it will works.Thanks
I also faced this problem and I used following code:
date('Y-m-d', strtotime(str_replace('/', '-', $_POST['date'])))
Related
I would like to display error checking next to the input field. Currently, errors are displayed at the top of the page.
Maybe there is some way to check for input errors?
I could not find a similar example where html and php code are separated into different files
Or my code is completely wrong.
index.php
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="css/style.css">
<title>testpage</title>
</head>
<body>
<?php
require('process.php');
?>
<h1>Form</h1>
<form method="post" action="">
<div> Date : <input type="date" name="date"/><br />
</div>
<div>
<label>Start:</label>
<select name="starttime" style="margin-right:15px" >
<option value="09:00:00">09:00</option>
<option value="17:00:00">17:00</option>
</select>
<label>End:</label>
<select name="endtime">
<option value="18:00:00">18:00</option>
</select>
<br>
</div>
<div>
Name : <input type="text" name="user_name" placeholder="Name" /><br />
</div>
Mail : <input type="email" name="user_email" placeholder="Mail" /><br />
Message : <textarea name="user_text"></textarea><br />
<input type="submit" value="Send" />
</form>
<h3 class=" txt_center">DB Output <span id="curdate">
<?php require('calendar.php');
?>
<!-- <script type="text/javascript" src="js/time-select.js"></script> -->
</body>
</html>
process.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$u_date = filter_var($_POST["date"]);
$u_starttime = $_POST["starttime"];
$u_endtime = $_POST["endtime"];
$u_name = filter_var($_POST["user_name"]);
$u_email = filter_var($_POST["user_email"], FILTER_SANITIZE_EMAIL);
$u_text = filter_var($_POST["user_text"]);
$error = array();
if (empty($u_date)){
$error['date'] = 'Date is empty!';
}
elseif ( $u_starttime > $u_endtime ){
echo "*Incorrect time";
}
elseif (empty($u_name)){
echo "Name is empty.";
}
else{
require_once('db-connect.php');
$statement = $mysqli->prepare("INSERT INTO users_data (date, start_time, end_time, user_name, user_email, user_message) VALUES(?, ?, ?, ?, ?, ?)");
$statement->bind_param('ssssss', $u_date, $u_starttime, $u_endtime, $u_name, $u_email, $u_text);
if($statement->execute()){
print "Hello, " . $u_name . "!, request is complete!";
}else{
print $mysqli->error;
}
}
}
?>
You can add the 'required' attribute to <input> elements, which get validated on form submission. E.g. <input type="date" name="date" required/> eliminating the necessity to write code for error output.
EDIT: here you can see how the warning is shown
Also, the validation
elseif ( $u_starttime > $u_endtime ){
echo "*Incorrect time";
}
is not required, since the user's choices already force starttime < endtime.
Cheers
Here is an example for setting date validation next to your date input fields.
in process.php:
` $errordate="";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$u_date = filter_var($_POST["date"]);
if (empty($u_date)){
$errordate= 'Date is empty!';
}}
and in your index.php:
<input type="date" name="date"/> * <?php echo "<p style='color:red;'>".$errordate . "</p>"; ?>
I´ve been working on this project for a quite while and, the other day I was doing some code when I walk by this piece of code that keeps giving me headaches. So i got my html and php code all right but whenever i try to upload an image to my database, the image goes null, what am i doing wrong?
<?php include "connection.php"; ?>
<?php
$n=$_POST["num"];
$t=$_POST["texto"];
$i=$_POST["imagem"];
$img = mysql_query("SELECT imagem2 from segurancaofensiva where nmr=$n");
$file = $_FILES['imagem']['tmp_name'];
$image = addslashes(file_get_contents($file));
$count = $connect->query("SELECT COUNT(DISTINCT nmr) FROM segurancaofensiva")->fetch_row()[0];
if ($connect->connect_error){
die("Connection failed: " . $connect->connect_error);
}
$sql = "UPDATE segurancaofensiva SET texto='$t', imagem='{$image}', imagem2='{$image}' where nmr=$n" ;
$sql1 = "UPDATE segurancaofensiva SET texto='$t', imagem='$img' where nmr=$n";
if ($_FILES['imagem']['name']!=='' && $connect->query($sql) !== false )
{
if ($n <= $count) {
echo "actualizou\n\n";
var_dump($n);
var_dump($i);
var_dump($image);
}
else
{
echo "nao atualizou numero fora dos limites";
}
} else {
if ($connect->query($sql1) !== false){
echo "atualizou\n\n";
} else {
echo "errp";
}
}
$connect->close();
?>
<?php include 'connection.php'; ?>
<?php
$campo = $_POST['selected'];
$query = "SELECT campo FROM segurancaofensiva";
$result1 = mysqli_query($connect, $query);
$stored = $campo;
$obterquery = "SELECT * FROM segurancaofensiva where campo ='$campo'";
$x = $connect->query ($obterquery) or die ("Erro na variavel resultado");
$final = $x->fetch_array (MYSQL_ASSOC);
?>
<html>
<body>
<head>
<link rel="stylesheet" type="text/css" href="css/styleBO.css">
</head>
<div class="formulario" style="width: 100%; height: 100%;">
<form name="form2" method="POST" action="">
<h6>Campo:</h6> <select name ="selected" id="selected" >
<?php while($row1 = mysqli_fetch_array($result1)):;?>
<option value="<?php echo $row1[0];?>"><?php echo $row1[0];?></option>
<?php endwhile;?>
</select>
<input type="submit" id="load" class="load" name="load" value="Carregar">
<input type="hidden" name="selectedValue" value="0"/><br>
</form>
</div>
<div class="formulario" id="form2" style="width: 100%; height: 100%;">
<form name="form1" target="apresenta" method="POST" action="menu3.php">
<label> Atualizar dados </label><br>
<h6>Texto:</h6><textarea name="texto" id="texto"><?php echo htmlspecialchars($final['texto']);?></textarea><br>
<h6>Imagem:</h6><input type="file" name="imagem"><br>
<input type="hidden" value="<?php echo htmlspecialchars($final['nmr']);?>" name="num">
<input type="submit" name="submit" value="Enviar" class="topo">
<input type="reset" value="Limpar" class="topo">
</form>
</div>
</body>
</html>
Change form html like below. PHP will not detect file object without this.
<form enctype="multipart/form-data">
Add form attribute as per your requirement.
You are missing enctype attribute in form tag
enctype='multipart/form-data'
If you post data and trying to upload file you must use enctype
I have a MySQL table named as letter and wish to insert records through the HTML data input form. Code as follows:
<head>
<meta charset="utf-8">
<link href="css/jquery-ui-1.10.1.css" rel="stylesheet">
<script src="js/jquery-1.9.1.js"></script>
<script src="js/jquery-ui-1.10.1.min.js"></script>
<script>
$(function() {
$( "#datepicker" ).datepicker(({ dateFormat: "yy-mm-dd" }));
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Add Letter</title>
<style type="text/css" media="screen">
#import "style_contactform.css";
</style>
</head>
<?php
$querymethod = "select r_method_code, r_method from r_method order by r_method";
$resultmethod = mysql_query($querymethod) or die ( mysql_error());
$querybranch = "select bcode, branch from branch order by branch";
$resultbranch = mysql_query($querybranch) or die ( mysql_error());
$querytype = "select tcode, type from type order by type";
$resulttype = mysql_query($querytype) or die ( mysql_error());
?>
<?php
if (isset($_POST["submit"]))
{
$rno =$_POST["rno"];
$lno =$_POST["lno"];
$dol = mysql_real_escape_string($_POST["doi"]);
$hdg =$_POST["hdg"];
$from =$_POST["from"];
$address =$_POST["address"];
$method =$_POST["method"];
$type =$_POST["type"];
$branch =$_POST["branch"];
if ((empty($hdg))){
echo '<script language="javascript">';
echo 'alert("All fields must be required")';
echo '</script>';
}
else
{
$query ="INSERT INTO letter (reference_no, letter_no, date_stamp, heading, from_1, address, r_method_code, tcode, bcode) VALUES ('$rno', '$lno', '$dst', '$hdg', '$from', '$address', '$method', '$type', '$branch')";
$result = mysql_query($query) or die ( mysql_error());
$rc = mysql_affected_rows();
echo '<script language="javascript">';
echo 'alert("Added Successfully")';
echo '</script>';
}
}
?>
<html>
<form id="contactform">
<div class="formcolumn">
<label for="rno">Reference No:</label>
<input type="text" name="rno" />
<label for="lno">Letter No:</label>
<input type="text" name="lno" />
<label for="dst">Date of the Letter:</label>
<input type="text" name="dst" id="datepicker" />
<label for="hdg">Heading:</label>
<textarea name="hdg"></textarea>
</div>
<div class="formcolumn">
<label for="from">From 1:</label>
<input type="text" id="from" />
<label for="address">Address:</label>
<textarea id="address"></textarea>
<label for="method">Received Method:</label>
<select name="method" span class="al">
<?php
do {
?>
<option value="<?php echo $rowmethod['r_method_code']?>"><?php echo $rowmethod['r_method']?></option>
<?php
} while ($rowmethod = mysql_fetch_assoc($resultmethod));
?>
</select>
<label for="type">Type:</label>
<select name="type" span class="al">
<?php
do {
?>
<option value="<?php echo $rowtype['tcode']?>"><?php echo $rowtype['type']?></option>
<?php
} while ($rowtype = mysql_fetch_assoc($resulttype));
?>
</select>
<label for="branch">Branch:</label>
<select name="branch" span class="al">
<?php
do {
?>
<option value="<?php echo $rowbranch['bcode']?>"><?php echo $rowbranch['branch']?></option>
<?php
} while ($rowbranch = mysql_fetch_assoc($resultbranch));
?>
</select>
</div>
<div class="buttons">
<input class="button" type="submit" value="Submit!" />
</div>
</form>
</html>
But I was unable to add records through this form to the relevant table. I can not understand what I am going wrong. Can any one help me?... Pls...
Form's Attribute method's default value is get
You should specify it like this
<form id="contactform" method="post">
Now you can use $_POST to get data!
I tried to make a code which will add an entry to my MySQL table (called "rechnungen") via php. So I made some inputs in html and finaly I tried to insert the informations into my table (using the INSERT INTO... command). So this is what i made:
<?php
Session_Start();
$username=$_SESSION['username'];
$password=$_SESSION['password'];
$dbname=$_SESSION['dbname'];
$servername=$_SESSION['hostname'];
/*conn dev*/
$conn = mysql_connect($servername, $username, $password);
if($conn === false){
header("Location: LogIn.php");
}
?>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
<title></title>
</head>
<body>
<main>
<form method="POST" action="">
<div class="form_neueRechnung">
<!-- part 1 -->
<input type="text" name="suche_Vname_Patienten" placeholder="Vorname" required="">
<input type="text" name="suche_Nname_Patienten" placeholder="Nachname" required="">
<input type="number" id="id_Patient" name="id_patient" placeholder="Pat. Nr." Value="
<?php echo $KID_output; ?>" required="">
</td>
<input type="radio" name="Behandlung" value="Osteopathie" onclick="andere()" required="">
<input type="radio" name="Behandlung" value="Krankengymnastik" onclick="andere()" required="">
<input type="radio" name="Behandlung" id="andere_Behandlung" value="andere" onclick="andere()" required="">
<input type="text" name="andereBehandlung_text" id="andereBehandlung_text" placeholder="andere" style="visibility:hidden">
<!-- part 2 -->
<input type="radio" name="rezept_rechnung" id="mit_rezept" value="mit_Rezept" onclick="rezept()" required="">
<input type="radio" name="rezept_rechnung" id="ohne_rezept" value="ohne_Rezept" onclick="rezept()" required="">
<input type="text" id="ohne_rezept_text" name="ohne_rezept_text" placeholder="freier Text">
<!-- part 3 -->
<input type="time" name="termin1_von" required="">
<input type="time" name="termin1_bis" required="">
<input type="date" name="termin1_date" required="">
<!-- submit -->
<input type="submit" class="submit" value="Rechnug erstellen" name="submit" id="submit">
</div>
<div class="form_fieldset" id="rezept_einstellungen" style="visibility:hidden">
<input type="date" id="rezept_datum" name="rezept_datum">
<input type="text" id="rezept_verordnung" name="rezept_verordnung">
<input type="text" id="rezept_diagnose" name="rezept_diagnose">
</div>
</form>
<script type="text/javascript">
function andere() {
if (document.getElementById('andere_Behandlung').checked) {
document.getElementById('andere_BehandlungArt').style.visibility = 'visible';
} else {
document.getElementById('andere_BehandlungArt').style.visibility = 'hidden';
}
}
function rezept() {
if (document.getElementById('mit_rezept').checked) {
document.getElementById('rezept_einstellungen').style.visibility = 'visible';
} else {
document.getElementById('rezept_einstellungen').style.visibility = 'hidden';
}
if (document.getElementById('ohne_rezept').checked) {
document.getElementById('ohne_rezept_text').style.visibility = 'visible';
} else {
document.getElementById('ohne_rezept_text').style.visibility = 'hidden';
}
}
</script>
<?php
mysql_connect("$servername","$username","$password") or die("connection failed!");
mysql_select_db($dbname) or die ("no database found");
$query = mysql_query("SELECT * FROM `rechnungen`");
while($row = mysql_fetch_array($query)){
$RID = $row['RechnungsID'];
}
$RechnungsID = max($RID ,$RID)+1;
echo $RechnungsID;
$mit_ohne_Rezept = "";
if(isset($_POST['submit'])) {
if($_POST['rezept_rechnung'] == "mit_Rezept") {
$mit_ohne_Rezept = "1";
}
else {
$mit_ohne_Rezept = "0";
}
}
if(isset($_POST['submit'])){
$KundenID=$_POST['id_patient'];
$Behandlung=$_POST['Behandlung'];
$Rezept_datum=$_POST['rezept_datum'];
$Rezept_Verordnung=$_POST['rezept_verordnung'];
$Rezept_Diagnose=$_POST['rezept_diagnose'];
$ohneRezept_text=$_POST['ohne_rezept_text'];
mysql_select_db($dbname,$conn);
$result = "INSERT INTO rechnungen (`RechnungsID`, `KundenID`, `Behandlung`, `mit_ohne_Rezept`, `Rezept_datum`, `Rezept_Verordnung`, `Rezept_Diagnose`, `ohneRezept_text`)
VALUES ('$RechnungsID','$KundenID','$Behandlung','$mit_ohne_Rezept','$Rezept_datum','$Rezept_Verordnung','$Rezept_Diagnose','$ohneRezept_text)";
if (mysql_query($result)) {
echo ("finished!");
} else {
echo "error". mysql_error();
}
}
mysql_close($conn);
?>
</main>
</body>
</html>
I know it's a pretty long code, but i don't know where the problem could be. I'm getting this error:
errorYou have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''sdfas)' at line 2
please help me. I'm despairing.
','$ohneRezept_text)";
looks like the issue is here.
missing a quotation mark?
that's what the error is saying
also you don't need to wrap variables in quotations, well you can but its still a pain. if your input contains quotation marks it skips right out. Use addslashes()
I came up with a problem which made me crazy as I am new to PHP. The problem is: the below timetable submission form works good on Chrome (every time I left the email unfilled, the submission cannot be processed). However, when using on safari, you can always submit blank form into the database.
Here is the html form.
<script type="text/javascript" src="/membership/my-form/js/jquery-2.1.1.js"></script>
<script type="text/javascript" src="/membership/my-form/js/main.js"></script>
<form class="mf-form floating-labels" method="post" action="timetablesubmit.php">
<div>
<h1 style="text-align:center">Availability form</h1>
</div>
<div>
<p class="mf-select icon">
<select name="timetable-staff" class="user" required>
<option value="">Select Person</option>
<option value="AMY">Amy</option>
<option value="TOM">Tom</option>
</select>
</p>
<div>
<input name="location1" value="A" type="hidden">
<input name="location2" value="B" type="hidden">
</div>
<div class="AMY box">You work in A.</div>
<div class="TOM box">You work in B.</div>
</div>
<div class="icon">
<label class="mf-label" for="mf-email">Email Address</label>
<input class="email" type="email" name="timetable-email" id="mf-email" required>
</div>
</form>
<script type="text/javascript">
$(document).ready(function(){
$("select").change(function(){
$( "select option:selected").each(function(){
if($(this).attr("value")=="Amy"){
$(".box").hide();
$(".AMY").show();
}
if($(this).attr("value")=="Tom"){
$(".box").hide();
$(".TOM").show();
}
});
}).change();
});
</script>
<style type="text/css">
.box{
padding: 10px;
display: none;
margin-top: 20px;
border: 1px solid #000;
font-size:1.6em;
text-align:center;
background-color: #f1f1f1;
}
</style>
Here is the timetablesubmit.php:
<?php
header("content-type:text/html;charset=utf-8");
session_start();
$timesubmit=date('Y-m-d H:i:s');
$staff=$_POST['timetable-staff'];
$email=$_POST['timetable-email'];
$con=mysql_connect("localhost","database","password");
if (!$con) {
die ('Could not connect:' . mysql_error());
}
mysql_select_db("database", $con);
mysql_query("set names utf8");
mysql_query("INSERT INTO timetable(staff,email)
VALUES('$staff','$email')");
mysql_close($con);
sleep(2);
?>
<html>
<? require 'header.php'; ?>
<div class="tk-reg">
<p>Thak you <?php echo $_POST['timetable-staff']; ?><p>
<p> Time availability submitted successfully.<p>
Your email address is: <?php echo $_POST["timetable-email"]; ?>
</div>
<div class="tk-regfollow">
<ul style="text-align:center">
Back to home page.
</ul>
</div>
</html>
Then I searched the Internet and changed to below, still not working on Safari (the alert appears, however data still been insert into database.
<?php
require 'header.php';
$nameErr = $emailErr = "";
$name = $email = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["timetable-staff"])) {
$nameErr = "Please select a staff.";
} else {
$staff = test_input($_POST["timetable-staff"]);
}
if (empty($_POST["timetable-email"])) {
$emailErr = "Email address is required";
} else {
$email = test_input($_POST["timetable-email"]);
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
$con=mysql_connect("localhost","database_name","database_password");
if (!$con) {
die ('Could not connect:' . mysql_error());
}
mysql_select_db("database_name", $con);
mysql_query("set names utf8");
mysql_query("INSERT INTO timetable(staff,email)
VALUES('$staff','$email')");
mysql_close($con);
sleep(2);
?>
<html>
<style>
.error {color: #FF0000;}
</style>
<h1 style="text-align:center">Availability form for
<?php
$d=strtotime("+1 Months");
echo date("M", $d) . " 2015 <br>";
?>
</h1>
<form class="mf-form floating-labels" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<div>
<p class="mf-select icon">
<select name="timetable-staff" class="user" required>
<option value="">Select Person</option>
<option value="AMY">Amy</option>
<option value="TOM">Tom</option>
</select>
<span class="error">* <?php echo $nameErr;?></span>
</p>
</div>
<div class="icon">
<label class="mf-label" for="mf-email">Email Address</label>
<input class="email" type="email" name="timetable-email" id="mf-email" required>
<span class="error">* <?php echo $emailErr;?></span>
</div>
<br><br>
<input type="submit" name="submit" value="Submit">
</form>
</html>
I hope someone could help me pointing out my mistakes. Thank you.
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I tried a lot of ways to figure this out, however still have either 'this' or 'that' problems. I finally use a method that actually work, but I do not know whether it is not recommended.
Here is the code I modified in timetablesubmit.php
(my flow is: timetable.php ==>timetablesubmit.php==>welcome.php)
$email = trim($_POST['timetable-email']);
if($email !='' and $email !=null) {
$sql1;
}
else {
echo '<html><head>
<link rel="stylesheet" type="text/css" href="/membership/style.css"/>
<head>
<div class="check-error-message">
<p>Error: Email address is required.</p><br>
Return
</div>';
exit;
};
You can check with condition before insert operation
if($nameErr =="" && $emailErr == "")
{
mysql_query("INSERT INTO timetable(staff,email)
VALUES('$staff','$email')");
}
you can have one condition here to avoid empty fill
mysql_query("INSERT INTO timetable(staff,email)
VALUES('$staff','$email')");
here keep this condition like this
if($staff!='' && $email!='')
{
mysql_query("INSERT INTO timetable(staff,email)
VALUES('$staff','$email')");
}
Html 5 "required" will not work in safari.
This line is the problem <input class="email" type="email" name="timetable-email" id="mf-email" required>
Write jquery/javascript validation to check the required field.
Hope its help you.
As they said, not all browsers accept the attribute required because it's new.
On PHP, server side, you can validate too if there's something filled with:
$var = trim($_POST['var']);
if(!is_empty($var)) {
//do mysqli function
}
else {
//show error
}
trim will remove blank spaces at start and end of the value given.
is_empty will be almost like $var == ""