The implementation method of PHP class coherence operation

Source: Internet
Author: User
The consistent operation in PHP looks really cool, it's very handy for code reading, of course, it has to be used in OOP, and in a procedural process, there's no need to use this method. There are useful _call to implement this method, and I write the following example, it is not used _call, we can expand it.

The following write this SQL statement combination class, is mainly used for learning, if there are students want to take to use, please perfect again.

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/* * SQL statement combination instance class, originating article Web development Note * www.chhua.com * Learning, non-professional class * */class sql{private $sql =arr Ay ("from" and "" "," where "=" "," order "=" "", "limit" = ""); Public function from ($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= ') {$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 ()->select ();//Output SELECT * From TestTable WHERE id=1 ORDER by id DESC LIMIT 0,10 
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