PHP: Validation of US Phone numbers - php

Question

I am currently working with validation of US phone numbers. The issue is that code below is always echoing after a valid or invalid input Please enter a valid phone number . My basic logic of my code is that I am checking with the preg_match to see if there is match for a valid number. Example
How can I fix this or is there a better way to validate phone numbers?
Also, Is there away to echo the number formatted like this: [phone]?
PHP:
if (isset($_POST['phone'])) {
if(preg_match('/^(\({1}\d{3}\){1}|\d{3})(\s|-|.)\d{3}(\s|-|.)\d{4}$/',$phone)) {
echo ('<div id="phone_input"><span id="resultval">'.$phone.'</span></div>');
}
else {
echo '<div id="phone_input"><span id="resultval">Please enter a valid phone number</span></div>';
}
}

Answer 1

Try This
<?php
class Validation {
public $default_filters = array(
'phone' => array(
'regex'=>'/^\(?(\d{3})\)?[-\. ]?(\d{3})[-\. ]?(\d{4})$/',
'message' => 'is not a valid US phone number format.'
)
);
public $filter_list = array();
function Validation($filters=false) {
if(is_array($filters)) {
$this->filters = $filters;
} else {
$this->filters = array();
}
}
function validate($filter,$value) {
if(in_array($filter,$this->filters)) {
if(in_array('default_filter',$this->filters[$filter])) {
$f = $this->default_filters[$this->filters[$filter]['default_filter']];
if(in_array('message',$this->filters[$filter])) {
$f['message'] = $this->filters[$filter]['message'];
}
} else {
$f = $this->filters[$filter];
}
} else {
$f = $this->default_filters[$filter];
}
if(!preg_match($f['regex'],$value)) {
$ret = array();
$ret[$filter] = $f['message'];
return $ret;
}
return true;
}
}
//example usage
$validation = new Validation();
echo nl2br(print_r($validation->validate('phone','555-555-1212'),true));
echo nl2br(print_r($validation->validate('phone','(555)-555-1212'),true));
echo nl2br(print_r($validation->validate('phone','555 555 1212'),true));
echo nl2br(print_r($validation->validate('phone','555.555.1212'),true));
echo nl2br(print_r($validation->validate('phone','(555).555.1212'),true));
echo nl2br(print_r($validation->validate('phone','(555)---555.1212'),true));//will not match
?>