偶然看到php的链式操作写法，觉得很有意思，特别记录一下 ，摘抄自网友实例
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代码参考
class 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
