International Phone Number Validation in PHP

In this tutorial you will learn about getting International phone numbers and validating them using PHP programming. When phone numbers are obtained from users using form fields, its a good practice to validate the phone number value using PHP code. The following example explains how it can be done for International Phone Numbers.

Example:

International Phone Number Validation


Enter your Phone Number	Country Code	Area Code	Phone Number

For the above input, the error message generated is as shown below:

Error Enter valid ISD Code
Error Enter valid Area Code
Error Enter valid Phonenumber.

Use the sample code given below in your test page and try it yourself.

Sample PHP Code:

<?php
//Check whether the submission is made
if(!isset($_POST["hidSubmit"])){

//Declarate the necessary variables
$intisd="";
$intccode="";
$intphone="";
DisplayForm();
}
else{

//Assign the entered values to variables for validation
$intisd=$_POST["txtisdcode"];
$intccode=$_POST["txtcitycode"];
$intphone=$_POST["txtphone"];

//The entered value is checked for proper format
if(substr_count($intisd,"+")>0){
if(strpos($intisd,"+")==0)
$intisd=substr($intisd,1,strlen($intisd));
}
$result=ereg("^[0-9]+$",$intisd,$trashed);
$result=ereg("^[0-9]+$",$intisd,$trashed);
if(!($result)){echo "Enter Valid ISDCODE";}
$result=ereg("^[0-9]+$",$intccode,$trashed);
if(!($result)){echo "Enter Valid CITY CODE";}
$result=ereg("^[0-9]+$",$intphone,$trashed);
if(!($result)){echo "Enter Valid Phone Number";}
DisplayForm();
}

//User-defined Function to display the form in case of Error
function DisplayForm(){
global $intisd,$intccode,$intphone;
?>

HTML code for the form follows..

Cut 'n' Paste Code for the above Example

HTML CODE

<form name="form1" method="post" action=""> <table width="100%" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#0033FF" bgcolor="#DEE3EF" > <tr><td width="100%"> <table width="60%" height="25%" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#DEE3ED"> <caption align="left" class="heading"> Phone Number Validation </caption> <tr> <td width="46%" class="text"><div align="right">Enter Your Phone Number </div> <td width="5%"><input name="txtisdcode" type="text" class="textbox" size="7" value="<?php echo $intisd; ?>" maxlength="5"> <td width="10%"><input name="txtcitycode" type="text" class="textbox" size="7" value="<?php echo $intccode;?>" maxlength="5"> <td width="26%"><input name="txtphone" type="text" class="textbox" value="<?php echo $intphone;?>" maxlength="20" > </tr> <tr> <td colspan="4"><div align="center"> <br> <input type="submit" name="Submit" value="Submit"> <input name="hidSubmit" type="hidden" id="hidSubmit" value="true"> </div></td> </tr> </table> <div align="center"></div> </td> </tr> </table> </form> <?php return; } ?>

Refer: Explanation of Code

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