/**
 * 根据生日计算年龄
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
function birthday($birthday){ 
 $age = strtotime($birthday); 
 if($age === false){ 
  return false; 
 } 
 list($y1,$m1,$d1) = explode("-",date("Y-m-d",$age)); 
 $now = strtotime("now"); 
 list($y2,$m2,$d2) = explode("-",$now)); 
 $age = $y2 - $y1; 
 if((int)($m2.$d2) < (int)($m1.$d1)) 
  $age -= 1; 
 return $age; 
} 
echo birthday('1986-07-22'); 

/***   来自编程之家 jb51.cc（jb51.cc）   ***/