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Validation in PHP

Posted by Vineet Kumar Saini Articles | PHP March 13, 2012
Using this article one can easily understand how to apply validation in a PHP form.
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Introduction

Validation is a process by which we can prevent erroneous/incorrect data in the form/server. To ensure valid data is collected, we apply a set of validations to data we collect. Validation is a set of rules that you apply to the data you collect. It is very essential to have the input to your form validated before taking the form submission data for further processing. When there are many fields in the form, the PHP validation script becomes too complex. Make sure you make it a habit to validate all your web pages before publishing. When you validate web pages or a web form using a validation process, you simply check the content of the code to ensure it is valid and free from errors.

Code

<?php
 
$con=mysql_connect("localhost","root","");
 mysql_select_db(
"sunderdeep",$con);
 @$a=$_POST[
'text_name'];
 @$b=$_POST[
'text_mobile'];
 @$c=$_POST[
'text_email'];
 @$d=$_POST[
'text_user'];
 @$e=$_POST[
'text_pass'];
 @$f=$_POST[
'text_repass'];
 
if(@$_POST['insert'])
 {
 
//echo $sql1="insert into emp values('$a','$b','$c','$d','$e','$f')";
 //mysql_query($sql1);
 
echo "Your Data Successfully Saved";
 }
 
?>
 
<html>
 
    <head></head>
 
    <script language="javascript" type="text/javascript">
 
    function validate()
     {
    
if(document.getElementById("text_name").value=="")
     {
         alert(
"Please Enter Your Name");
         document.getElementById(
"text_name").focus();
        
return false;
     }
    
if(!(isNaN(document.validation.text_name.value)))
     {
         alert(
"Name has character only!");
        
return false;
     }
    
if(document.getElementById("text_mobile").value=="")
     {
         alert(
"Please Enter Your Mobile Number");
         document.getElementById(
"text_mobile").focus();
        
return false;
     }
    
if((isNaN(document.validation.text_mobile.value)))
     {
         alert(
"Mobile has numeric only!");
        
return false;
     }
    
var emailPat=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
 
    var emailid=document.getElementById("text_email").value;
    
var matchArray = emailid.match(emailPat);
    
if (matchArray == null)
     {
         alert(
"Your email address is wrong. Please try again.");
         document.getElementById(
"text_email").focus();
        
return false;
     }
    
if(document.getElementById("text_user").value=="")
     {
         alert(
"Please Enter User Name");
         document.getElementById(
"text_user").focus();
        
return false;
     }
    
if(document.getElementById("text_pass").value=="")
     {
         alert(
"Please Enter Your Password");
         document.getElementById(
"text_pass").focus();
        
return false;
     }
 
    if(document.getElementById("text_repass").value=="")
 
    {
         alert(
"Please ReEnter Your Password");
         document.getElementById(
"text_repass").focus();
        
return false;
     }
    
if(document.getElementById("text_repass").value!="")
     {
          
if(document.getElementById("text_repass").value != document.getElementById("text_pass").value)
           {
                alert(
"Confirm Password doesnot match!");
                document.getElementById(
"text_repass").focus();
               
return false;
           }
     }
    
return true;
 }
 
</script>
 
    <body bgcolor="pink">
 
        <form name="validation" method="post" onsubmit="return validate();">
 
        <center>
 
            <h3><u>Validation in PHP</u></h3>
 
    <table border="2">
 
       <tr>
 
        <td width="179">Name</td>
 
    <td><label>
 
      <input name="text_name" type="text" id="text_name" />
 
    </label></td>
 
  </tr>
 
  <tr>
 
    <td width="179">Phone/Mobile</td>
 
    <td><label>
 
      <input name="text_mobile" type="text" id="text_mobile" />
 
    </label></td>
 
  </tr>
 
  <tr>
 
    <td width="179">Email address </td>
 
    <td><label>
 
      <input name="text_email" type="text" id="text_email" />
 
    </label></td>
 
  </tr>
 
  <tr>
 
    <td>User Name</td>
 
    <td><label>
 
      <input name="text_user" type="text" id="text_user" />
 
    </label></td>
 
  </tr>
 
  <tr>
 
    <td>Password </td>
 
    <td><label>
 
      <input name="text_pass" type="password" id="text_pass" />
 
    </label></td>
 
  </tr>
 
  <tr>
 
    <td>Confirm Password</td>
 
    <td><label>
 
      <input name="text_repass" type="password" id="text_repass" />
 
    </label></td>
 
  </tr>
 
  <tr align="center">
 
    <td colspan="2"><label>
 
      <input type="submit" name="insert" value="Save" />
 
    </label></td>
 
    </tr>
 </
table>
 </
center>
 </
form>
 </
body>
 </
html>

 Output

image1.jpg

If you do not enter a name in the name column then there will be an error produced i.e. "Please enter your name". Like as in the following image.

1st.jpg

If you will enter a digit in the name column then there will also be an error produced i.e. "Name has character only". Like as in the following image.

2nd.jpg

If you enter a character in the mobile/phone column then there will be an error produced i.e. "Mobile has numeric only". Like as in the following image.

3rd.jpg

If you enter an incorrect format of mail id in the mail address column then there will be an error produced i.e. "Your mail address is wrong . Please try again". Like as in the following image.

4th.jpg

If you do not enter a password in the password column then there will be an error produced i.e. "please enter password". Like as in the following image.

5th.jpg

If you do not re-enter a correct password then there will be an error produced i.e. "Confirm password does not match". Like as in the following image.

6th.jpg

When you fill in all columns correctly and you click on the save button then there will be an error produced i.e. "Your data successfully saved". Like as in the following image.

image7.jpg

Conclusion

So in this article you saw how to apply validation in a form. Using this article one can easily understand validation in PHP.

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