PHP实现链式操作

Posted 2023-02-23 小竹_phper

php链式操作的关键是在做完操作后要return $this；

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一、不使用__call方法实现链式操作

<?php
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
?>

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二、使用__call方法实现链式操作

__call()在对象调用一个不可访问的方法时会被触发，所以可以实现类的动态方法的创建，实现php的方法重载功能，但它其实是一个语法糖（__construct()方法也是）。

<?php
class String

    public $value;

    public function __construct($str=null)
    
        $this->value = $str;
    

    public function __call($name, $args)
    
        $this->value = call_user_func($name, $this->value, $args[0]);
        return $this;
    

    public function strlen()
    
        return strlen($this->value);
    

$str = new String('01389');
echo $str->trim('0')->strlen();
// 输出结果为 4；trim('0')后$str为"1389"
?>