CODEWITHSUNDEEP
php
mcgrailm
mcgrailm

Reputation: 17638

splitting an array without foreach

I have an array of items

 $arr1 = Array(266=>"foo",178=>"bar",3="foobar");

and then I have an of array of numbers like this

 $arr2 = Array(0 => 266, 1 => 178);

and so what I want to do is split array one into two arrays

where the values of $arr2 that match the index of $arr1 are moved to a new array so I am left with

 $arr1 = Array(3="foobar");

 $arr2= Array(266=>"foo",178=>"bar");

that said I know I could do this with a foreach loop but I wonder if this is a simpler and faster way to do this

something like array_diff would be could but I don't think that will work

Upvotes: 3

Views: 227

Answers (3)

Aaron W.
Aaron W.

Reputation: 9299

Try:

$arr1 = array(266=>"foo",178=>"bar",3=>"foobar");
$arr2 = array(0 => 266, 1 => 178);

$tmp = array_diff_key ($arr1, array_flip($arr2));
$arr2 = array_diff($arr1,$tmp);
$arr1 = $tmp;

Upvotes: 2

Berry Langerak
Berry Langerak

Reputation: 18859

This should do what you want:

<?php
$arr1 = array( 
    266 => "foo",
    178 => "bar",
    3 => "foobar"
);

$arr2 = array(
    0 => 266,
    1 => 178
);

$foo = array_filter( 
    array_flip( $arr1 ),
    function( $key ) use ( $arr2 ) {
        return in_array( $key, $arr2 );
    }
);

var_dump( array_flip( $foo ) );

The two array_flip's are there because array_filter will only take the value, not the key. Effectively, I'm not too sure whether or not this is more efficient than foreach though, you'd have to test.

Upvotes: 0

symcbean
symcbean

Reputation: 48367

$arr2=array_interest($arr1,array_flip($arr2));
$arr1=array_diff($arr1, $arr2);

Upvotes: 0

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