如何防止调用不存在的方法而出错,使用__call魔术重载方法.
<?php
class HandsonBoy
{
private $name = ‘chenqionghe‘;
private $age = 18;
public function __call($name,$arguments)
{
switch(count($arguments))
{
case 2:
echo $arguments[0] * $arguments[1],PHP_EOL;
break;
case 3:
echo array_sum($arguments),PHP_EOL;
break;
default:
echo ‘参数不对‘,PHP_EOL;
break;
}
}
}
$a = new HandsonBoy();
$a->make(5);
$a->make(5,6);
<?php
abstract class ActiveRecord
{
protected static $table;
protected $fieldvalue;
public $select;
static function findById($id)
{
$query = "SELECT * FROM " . static::$table . " WHERE id=$id";
return self::createDomain($query);
}
function __get($fieldname)
{
return $this->fieldvalues[$fieldname];
}
static function __callStatic($method,$args)
{
$field = preg_replace(‘/^findBy(\w*)$/‘, ‘$1‘ , $method);
$query = "SELECT * FROM " . static::$table . " WHERE $field=‘$args[0]‘";
return self::createDomain($query);
}
private static function createDomain($query)
{
$class = get_called_class();//获取静态方法调用的类名
$domain = new $class();
$domain->fieldvalues = array();
$domain->select = $query;
foreach ($class::$fields as $field => $type)
{
$domain->fieldvalues[$field] = ‘TODO:set from sql result by ‘ . $field;
}
return $domain;
}
}
class Customer extends ActiveRecord
{
protected static $table = ‘custdb‘;
protected static $fields = array(
‘id‘ => ‘int‘,
‘email‘ => ‘int‘,
‘lastname‘ => ‘varchar‘
);
}
class Sales extends ActiveRecord
{
protected static $table = ‘salesdb‘;
protected static $fields = array(
‘id‘ => ‘int‘,
‘item‘ => ‘varchar‘,
‘qty‘ => ‘int‘
);
}
var_dump(Customer::findById(123)->select);
var_dump(Customer::findById(123)->email);
var_dump(Sales::findByLastname(‘Denoncourt‘)->select);
原文：http://www.cnblogs.com/chenqionghe/p/4735703.html