Nested functions php

Question

I have two classes, Emp and Dep. I want to get a result something familiar to this:

$objDep = new Dep();
$objDep->SetName('Sales');

$objEmp = new Emp();
$objEmp->SetDep($objDep);

$objDep->GetEmps()->Add($objEmp);
$objDep->GetEmps(0)->GetDep()->GetName(); //result 'sales'

I have written this in Dep class:

...
public $_emps = array();
...

...
public function GetEmps() {
        $params = func_get_args();
        $numargs = func_num_args();

        if (func_num_args()) {
            return $this->_emps[$params[0]];
        }

        function Add($new_emp)
        {
            array_push($this->_emps,$new_emp); 
        }

    }
...

and a I'm having an error:

Fatal error: Call to a member function Add() on a non-object.

What is wrong with this code?

Maybe this is simple but I'm new in PHP and I want to complete my exercise for classes.

You might have meant to use $objDep->GetEmps(0)->SetDep()->GetName();? I don't see any other reference to GetDep() — Funk Forty Niner
– Funk Forty Niner, Commented Jun 1, 2014 at 0:18
Put Add method outside the GetEmps method, so its just another method in the class. Emp's and Dep's makes no sense, a good naming convention and class entity would make it clearer to yourself — Lawrence Cherone
– Lawrence Cherone, Commented Jun 1, 2014 at 0:21

Dave Chen · Accepted Answer · 2014-06-03 04:25:08Z

1

If you want to chain methods, you will want to return $this.

Example:

public function GetEmps() {
    $params = func_get_args();
    $numargs = func_num_args();

    if (func_num_args()) {
        return $this->_emps[$params[0]];
    }

    return $this;
}

public function Add($new_emp) {
    array_push($this->_emps,$new_emp);

    return $this;
}

You may also chain Add, which can result in $obj->Add($emp1)->Add($emp2)->Add($emp3)->getEmps().

You will need to make the function Add a member of the class as well.

edited Jun 3, 2014 at 4:25

answered Jun 1, 2014 at 0:22

Dave Chen

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