Php form handling and validation

PHP form handling and validation in 2021

PHP form handling and validation

Form validation in PHP: Validation means to check the input data by the user is in the correct format or not, form validation is necessary to provide security of data. It is also important to protect your form data from hackers and spammers.

Validation rules for the field in PHP?

Name

1. It must contain only letters and white spaces.

2. It is required.

Contact

1. It must contain only letters.

2. It is required.

Email

1. It must be a valid email address with @ and dot(.).

2. It is required.

Website

1. It must be a valid URL.

2. It is required.

Validation on contact

<input type="number" name="txtcon">

Validation on email method 1

<input type="email" name="txtemail">

Validation on email method 2

filter_var() is a predefined function which is used to provide validation on email,url,IP address etc.

<input type="email" name="txtemail">

How to validation on email in PHP?

<?php

$email = $_POST['txtemail'];

if (filter_var($email, FILTER_VALIDATE_EMAIL) == true) {

echo("$email is a valid ");

} else {

echo("$email is not a valid ");

}

Validation on URL Method 1

filter_var() is a predefined function that is used to provide validation on email, URL, IP address, etc

How to validation URL in PHP?

<?php

$url=$_POST['txturl'];

if(filter_var($url,FILTER_VALIDATE_URL)==true)

{

echo "$url is valid";

}

else

{

echo "URL is not valid";

}

Validation on URL Method 2

<?php

$url =$_POST['txturl'];

if (preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$url))

{

echo "URL is valid";

}

else

{

echo "URL is not valid";

}

Form with Complete Validation

<?php

if(isset($_POST['btn']))

{

/*defining error variables and set them to empty */

$nameerr=$conerr=$emailerr=$weberr=$sererr="";

if(empty($_POST["txtn"]))

$nameerr="* Name is required";

if(empty($_POST["txtc"]))

$conerr="* Contact is required";

if(empty($_POST["txte"]))

$emailerr="* Email is required";

if(empty($_POST["txtweb"]))

$weberr="* URL is required";

if(empty($_POST["txts"]))

$sererr="* Service is required";

if(!empty($_POST["txtn"]) && !empty($_POST["txtc"]) && !empty($_POST["txte"]) && !empty($_POST["txtweb"]) && !empty($_POST["txts"]))

{

/*passing form data into php variables*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

$web=$_POST['txtweb'];

$ser=$_POST['txts'];

/*Validation on contact number */

if(strlen($c)!=10)

$conerr="Invalid contact number";

/*Validation on email*/

else if(!filter_var($e,FILTER_VALIDATE_EMAIL)==true)

$emailerr="Invalid email address";

/*Validation on Website URL*/

else if(!filter_var($web,FILTER_VALIDATE_URL)==true)

$emailerr="Invalid URL address";

else

{

/*Printing the result*/

echo "Traning center Details<br>";

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

echo "Website URL=".$web."<br>";

echo "Services=".$ser."<br>";

}

<html>

<head>

<title></title>

</head>

<body>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

<table border="0" width="40%" style="border:1px solid gray" cellpadding="5">

<tr><td colspan="2" align="center" style="font-size:25px">Training center Registration Form</td></tr>

<tr><td>Center Name</td><td><input type="text" name="txtn" />

<label style="color:red"><?php echo $nameerr; ?></label>

</td></tr>

<tr><td>Contact</td><td><input type="number" name="txtc" />

<label style="color:red"><?php echo $conerr; ?></label>

</td></tr>

<tr><td>Email</td><td><input type="email" name="txte" />

<label style="color:red"><?php echo $emailerr; ?></label>

</td></tr>

<tr>

<td>WebsiteURL</td><td><input type="text" name="txtweb" />

<label style="color:red"><?php echo $weberr; ?></label>

</td></tr>

<tr><td>Services</td><td>

<textarea cols="40" rows="5" name="txts">

</textarea>

<label style="color:red"><?php echo $sererr; ?></label>

</td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

*****OUTPUT*****

Registration Form
Center Name
Contact
Email
WebsiteURL	* URL is required
Services	* Service is required

Form validation is necessary to provide security of data. Form validation in PHP: Validation means to check the input data by the user is the incorrect format or not.

It is also important to protect your form data from hackers and spammers.

Required or Null Validation: Required is a property or attribute that specifies that an input field must be filled out before submitting the form.

It works with textbox, passwordbox, textrea, radiobutton etc.

<?php

if(isset($_POST['btn']))

{

/*Passing form data into php variable*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

/*Printing the result*/

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

}

<html>

<head>

<title>Form handling</title>

</head>

<body>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

<table border="0" width="30%" style="border:1px solid gray" cellpadding="5">

<tr><td>Name</td><td><input type="text" name="txtn" required/></td></tr>

<tr><td>Contact</td><td><input type="text" name="txtc" required/></td></tr>

<tr><td>Email</td><td><input type="text" name="txte" required/></td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

*****OUTPUT*****

Name=icoderweb
Contact=325734
Email=icderweb@gamil.com

Validation rules for field

Name

1. It must contain only letters and white spaces.

2. It is required.

Contact

1. It must contain only letters.

2. It is required.

Email

1. It must be a valid email address with @ and dot(.).

2. It is required.

Website

1. It must be a valid URL.

2. It is required.

Display the error message through PHP code

<?php

if(isset($_POST['btn']))

{

/*defining error variables and set them to empty */

$nameerr=$conerr=$emailerr=$generr=$addrerr="";

if(empty($_POST["txtn"]))

$nameerr="* Name is required";

if(empty($_POST["txtc"]))

$conerr="* Contact is required";

if(empty($_POST["txte"]))

$emailerr="* Email is required";

if(empty($_POST["gen"]))

$generr="* Gender is required";

if(empty($_POST["txta"]))

$addrerr="* Address is required";

if(!empty($_POST["txtn"]) && !empty($_POST["txtc"]) && !empty($_POST["txte"]) && !empty($_POST["gen"]) && !empty($_POST["txta"]))

{

/*passing form data into php variables*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

$gen=$_POST['gen'];

$addr=$_POST['txta'];

/*Printing the result*/

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

echo "Gender=".$gen."<br>";

echo "Address=".$addr."<br>";

}

<html>

<head>

<title></title>

</head>

<body>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

<table border="0" width="40%" style="border:1px solid gray" cellpadding="5">

<tr><td>Name</td><td><input type="text" name="txtn" />

<label style="color:red"><?php echo $nameerr; ?></label>

</td></tr>

<tr><td>Contact</td><td><input type="number" name="txtc" />

<label style="color:red"><?php echo $conerr; ?></label>

</td></tr>

<tr><td>Email</td><td><input type="email" name="txte" />

<label style="color:red"><?php echo $emailerr; ?></label>

</td></tr>

<tr><td>Gender</td><td>

<input type="radio" value="Male" name="gen"/>Male

<input type="radio" value="Female" name="gen"/>Female

<label style="color:red"><?php echo $generr; ?></label>

</td></tr>

<tr><td>Address</td><td>

<textarea cols="40" rows="5" name="txta">

</textarea>

<label style="color:red"><?php echo $addrerr; ?></label>

</td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

Registration Form
Center Name
Contact
Email
WebsiteURL	* URL is required
Services	* Service is required

Form in PHP: A form is a very important element of PHP by using form and PHP code we can store data into a database in a very simple way.

Creating a Simple HTML Form

<html>

<head>

<title>Form handling</title>

</head>

<body>

<form action="intro.php" method="post" enctype="multipart/form-data">

<table border="0" width="30%" style="border:1px solid gray" cellpadding="5">

<tr><td>Name</td><td><input type="text" name="txtn" /></td></tr>

<tr><td>Contact</td><td><input type="text" name="txtc" /></td></tr>

<tr><td>Email</td><td><input type="text" name="txte" /></td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

1. Here we are using the post method to send the data.

2. The variables name of the name, contact, and email textboxes are txtn,txtc and txte.

3. After filling the form when we will click submit button then form data will be sent to the intro.php file for processing.

Intro.php

<html>

<head>

<title>intro file</title>

</head>

<body>

<?php

/*Passing form data into php variable*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

/*Printing the result*/

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

</body>

</html>

Intro.php

<?php

if(isset($_POST['btn']))

{

/*Passing form data into php variable*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

/*Printing the result*/

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

}

<html>

<head>

<title>Form handling</title>

</head>

<body>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

<table border="0" width="30%" style="border:1px solid gray" cellpadding="5">

<tr><td>Name</td><td><input type="text" name="txtn" /></td></tr>

<tr><td>Contact</td><td><input type="text" name="txtc" /></td></tr>

<tr><td>Email</td><td><input type="text" name="txte" /></td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

Complete form in PHP: Here I am going to make a complete form of Student Registration in which I am using required validation and filter validation for Validating Email. I am trying to keep all the important form elements in a single form.

How to fill PHP complete form?

<?PHP

if(isset($_POST['btn']))

{

/*passing form data into php variables*/

$n=$_POST['txtn'];

$c=$_POST['txtc'];

$e=$_POST['txte'];

$gen=$_POST['gen'];

$dob=$_POST['dob'];

$city=$_POST['ddlcity'];

$addr=$_POST['txta'];

/*getting education data from checkbox*/

$edu="";

if(isset($_POST['chk10']))

$edu=$edu+" 10TH";

if(isset($_POST['chk12']))

$edu=$edu+" 12TH";

if(isset($_POST['BCA']))

$edu=$edu+" BCA";

if(isset($_POST['MCA']))

$edu=$edu+" MCA";

if(isset($_POST['B Tech']))

$edu=$edu+" B Tech";

if(isset($_POST['M Tech']))

$edu=$edu+" M Tech";

/*Validation on contact number */

if(strlen($c)!=10)

/*This message will display in popup box

Because we are using alert function which

is function of javascript*/

echo "<script>alert('Invalid contact number')</script>";

/*Validation on email*/

else if(!filter_var($e,FILTER_VALIDATE_EMAIL)==true)

echo "<script>alert('Invalid email address')</script>";

else

{

/*Printing the result*/

echo "Student Details<br>";

echo "Name=".$n."<br>";

echo "Contact=".$c."<br>";

echo "Email=".$e."<br>";

echo "Gender=".$gen."<br>";

echo "DOB=".$dob."<br>";

echo "City=".$city."<br>";

echo "Address=".$addr."<br>";

echo "Education=".$edu."<br>";

}

<html>

<head>

<title></title>

</head>

<body>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

<table border="0" width="40%" style="border:1px solid gray;font-weight:bold;font-family:arial;background-color:#CCCCCC" cellpadding="5" >

<tr><td colspan="2" align="center" style="font-size:25px">

Student Registration Form</td></tr>

<tr><td>Name</td><td><input type="text" name="txtn" required/>

</td></tr>

<tr><td>Contact</td><td><input type="number" name="txtc" required/>

</td></tr>

<tr><td>Email</td><td><input type="email" name="txte" required/>

</td></tr>

<tr><td>Gender</td><td><input type="radio" name="gen" value="Male" />Male<input type="radio" name="gen" value="Female" />Female

</td></tr>

<tr><td>DOB</td><td><input type="date" name="dob" required/>

</td></tr>

<tr><td>City</td><td>

<select name="ddlcity">

<option>Mumbai</option>

<option>Delhi</option>

<option>Pune</option>

<option>Nagpur</option>

<option>Patna</option>

</select>

</td></tr>

<tr><td>Address</td><td>

<textarea cols="40" rows="5" name="txta" required>

</textarea>

</td></tr>

<tr><td>Education</td><td>

<input type="checkbox" name="chk10" />10th<br />

<input type="checkbox" name="chk12" />12th<br />

<input type="checkbox" name="BCA" />BCA<br />

<input type="checkbox" name="MCA" />MCA<br />

<input type="checkbox" name="B Tech" />B Tech<br />

<input type="checkbox" name="M Tech" />M Tech<br />

</td></tr>

<tr><td></td><td><input type="submit" name="btn" value="Submit" /></td></tr>

</table>

</form>

</body>

</html>

*****OUTPUT*****

Php form handling and validation

PHP form handling and validation in 2021

PHP form handling and validation

How to validation URL in PHP?

Validation on URL Method 2

Form with Complete Validation

Display the error message through PHP code

Creating a Simple HTML Form

How to fill PHP complete form?

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Php form handling and validation

PHP form handling and validation in 2021

PHP form handling and validation

How to validation URL in PHP?

Validation on URL Method 2

Form with Complete Validation

Display the error message through PHP code

Creating a Simple HTML Form

How to fill PHP complete form?

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