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Validate and Format US Phone Numbers

Type:	code fragment
Added by:	elixer
Entered:	02/03/2000
Last modified:	08/12/1999
Rating:	(6 votes)
Views:	10575

This function takes an unformatted US phone number as its only argument then, using regular expressions, determines its validity and formats the number in (XXX) XXX-XXXX format.

<?php

                             function CheckUSPhoneNum( $PhoneNumber )

                             {

                                    $PhoneNumber = ereg_replace( "[^0-9]", "", $PhoneNumber ); // Strip out non-numerics    

                            

                                    if( ereg( "^([0-9]{3})([0-9]{3})([0-9]{4})$", $PhoneNumber, $NumberParts ) )                                   


                                            return "(" . $NumberParts[1] . ") " . $NumberParts[2] . "-" . $NumberParts[3];

                                    else

                                            return false;

                            }
?>

Usage Example

if( FormattedNumber = CheckUSPhoneNum( "123/123/1234" ) )

                                    echo "Valid Number: $FormattedNumber.n";

                            else

                                    echo "Invalid Number.n";

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