思路：链式语法就是对象调用方法执行赋值操作后返回一个对象，那就可以接着调用方法，最后一个方法返回具体sql语句
<?phpclass Sql{ ???private $sql=array("from"=>"", ???????????"where"=>"", ???????????"order"=>"", ???????????"limit"=>""); ???public function from($tableName) { ???????$this->sql["from"]="FROM ".$tableName; ???????return $this; ???} ???public function where($_where=‘1=1‘) { ???????$this->sql["where"]="WHERE ".$_where; ???????return $this; ???} ???public function order($_order=‘id DESC‘) { ???????$this->sql["order"]="ORDER BY ".$_order; ???????return $this; ???} ???public function limit($_limit=‘30‘) { ???????$this->sql["limit"]="LIMIT 0,".$_limit; ???????return $this; ???} ???public function select($_select=‘*‘) { ???????return "SELECT ".$_select." ".(implode(" ",$this->sql)); ???}}$sql =new Sql();echo $sql->from("testTable")->where("id=1")->order("id DESC")->limit(10)->select();//输出 SELECT * FROM testTable WHERE id=1 ORDER BY id DESC LIMIT 0,10?>
php 链式语法
原文地址：https://www.cnblogs.com/zxqblogrecord/p/8616079.html