PHP foreach stuck at values in first key

Question

I have a multidimensionel array of different departments, and a want to loop through it using a foreach loop, but for some reason, the foreach loop grabs the values under the first key through every iteration.

The array looks like this:

$departmentArray = 

Array
(
    [0] => Array
        (
            [dpt_id] => 5
            [dpt_name] => Administration
            [dpt_employees] => Array
                (
                [0] => Array
                    (
                        [started] => 2000-06-01
                        [stopped] => 9999-99-99
                        [empl_id] => 21
                    )

                [1] => Array
                    (
                        [started] => 2000-06-01
                        [stopped] => 2010-01-01
                        [empl_id] => 23
                    )
            )
    )

    [1] => Array
        (
            [dpt_id] => 6
            [dpt_name] => Warehouse
            [dpt_employees] => Array
                (
                [0] => Array
                    (
                        [started] => 2000-10-01
                        [stopped] => 2012-01-01
                        [empl_id] => 30
                    )

                [1] => Array
                    (
                        [started] => 2007-10-17
                        [stopped] => 9999-99-99
                        [empl_id] => 197
                    )
            )
    )
)

And the foreach loop looks like this:

foreach($departmentArray as $key => $value) {

    print_r($key);
    print_r($value['dpt_name']);

}

And this prints:

0 Administration 1 Administration.

Does anyone know, why the loop does not move forward in the array and grab the value (Warehouse) under key/index 1 during its second iteration?

No, this code would not print that. If your own code prints it, you are doing something different. Possibly iterating by reference and changing the values? — Jon
– Jon, Commented Sep 18, 2012 at 13:45
Thank you for answering. You are right, I am iterating by reference earlier in the code, where I use the same name, I will look into it now. — acrmuui
– acrmuui, Commented Sep 18, 2012 at 14:03

deceze · Accepted Answer · 2012-09-18 13:50:05Z

2

Total stab into the dark:

You have used $value in a foreach loop before as reference, like so:

foreach ($foo as &$value) { ... }

foreach ($departmentArray as $key => $value) { ... }

This is a well known side-effect of references. unset($value) after the first loop.

answered Sep 18, 2012 at 13:50

deceze♦

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1 Comment

acrmuui Over a year ago

Thank you for your stab in the dark, I think you are right, as I am iterating by reference earlier i the code. Should i unset() the $value in the first loop inside the curly brackets?

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