Callback function for array_filter

Question

class MyClass {
    private function isExist($arr) {
        // need to do some formatting here first

        // need to call in_array here to check whether to filter out duplicates
        return false; // temporary return value
    }

    public function test() {
        $data = array(
            array('foo' => 'alpha', 'bar' => 'bravo'),
            array('foo' => 'charlie', 'bar' => 'delta'),
            array('foo' => 'alpha', 'bar' => 'bravo'),
        );

        $result = array_filter($data, array('MyClass', 'isExist'));
        print_r($result);
    }
}

$obj = new MyClass();
$obj->test();

How to access the array being filtered within the callback function? And is it possible to pass one or two arguments to the callback function?

And I have PHP 5.3.1, just in case you'll need to know the version I am using.

EDIT: // separate formatting and then call array_unique

array_filter iterates over each entry in the array and calls the callback. You cannot pass another parameter. Are you trying to find unique entries in $data? i.e. Do you want $result to contain the first and second entries of $data, but not the third (since it is the same as the first)? — qbert220
– qbert220, Commented Feb 17, 2011 at 13:16
"Do you want $result to contain the first and second entries of $data, but not the third (since it is the same as the first)?" - yes, basically im trying to remove duplicate items — madkris24
– madkris24, Commented Feb 17, 2011 at 13:25

Shadikka · Accepted Answer · 2011-02-17 13:34:42Z

1

No need to reinvent the wheel here: http://php.net/array-unique

answered Feb 17, 2011 at 13:34

Shadikka

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1 Comment

madkris24 Over a year ago

Not sure if I got the answer first before this post was made but yea, I ended up using this function. +1

Thariama · Accepted Answer · 2011-02-17 13:10:48Z

0

Try

class MyClass {

    ...

    public function test() {
        $data = array(
            array('foo' => 'alpha', 'bar' => 'bravo'),
            array('foo' => 'charlie', 'bar' => 'delta'),
            array('foo' => 'alpha', 'bar' => 'bravo'),
        );

        $result = array_filter($data, array('MyClass', 'isExist'));
        return $result;
    }
}

$obj = new MyClass();
$array_filterd = $obj->test();

answered Feb 17, 2011 at 13:10

Thariama

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2 Comments

madkris24 Over a year ago

im sorry, the question may have been misleading. I have edited it, kindly take a look.

Thariama Over a year ago

using array_filter you can only access one element of your array that is used as input paramter for your isExist - you called it '@arr', but it is alwayys only one single array-element.

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