<?php 


$regexp = "/^\s*(([+]\s*7)|8)\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*[0-9]\W*$/mgu";

$correctNumbers = array();
$incorrectNumbers = array();

$numbers = array(  '84951234567',  '+74951234567', '8-495-1-234-567', 
  ' 8 (8122) 56-56-56', '8-911-1234567', '8 (911) 12 345 67', 
  '8-911 12 345 67', '8 (911) - 123 - 45 - 67', '+ 7 999 123 4567', 
  '8 ( 999 ) 1234567', '8 999 123 4567','02', '84951234567 позвать люсю', '849512345', '849512345678', 
  '8 (409) 123-123-123', '7900123467', '5005005001', '8888-8888-88',
  '84951a234567', '8495123456a', 
  '+1 234 5678901', 
  '+8 234 5678901', 
  '7 234 5678901' );
  
foreach ($numbers as $num) {
	if (preg_match($regexp,$num,$correctNumbers)) {
		foreach ($correctNumbers as $corrNum) {
			echo $corrNumb;
		}
	}
}	


?>