PHP implements the function of calculating age based on date of birth (code example)

<?php
/**
 * 根据出生年月日计算出年龄
 * @param $birth_year 
 * @param $birth_month
 * @param $birth_day
 * @return int
 */
function getAgeByBirth($birth_year,$birth_month,$birth_day){
  if(empty($birth_year) || empty($birth_month) || empty($birth_day)){
    return 0;
  }
  $current_year = date(&#39;Y&#39;,time());
  $current_month = date(&#39;m&#39;,time());
  $current_day = date(&#39;d&#39;,time());
  if($birth_year >= $current_year){
    return 0;
  }
  $age = $current_year - $birth_year - 1;
  if($current_month>$birth_month){
    return $age+1;
  }else if($current_month == $birth_month && $current_day>=$birth_day){
    return $age+1;
  }else{
    return $age;
  }
}
//测试：
echo getAgeByBirth(&#39;1988&#39;,&#39;4&#39;,&#39;8&#39;);
?>

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