unset part of a multidimensional variable with the elements of another array in PHP

Question

How to unset() some parts of my multimensional array?

I have an array similar like

$list['A_1']['AA_2']['AAA_3']['AAAA_4'] = 'stuff'; 
$list['B_1']['BB_2']['BBB_3'] = 'stuff'; 
$list['C_1']['CC_2']['CCC_3']['CCCC_4']['CCCCC_5']['CCCCCC_6']['CCCCCCC_7']['CCCCCCCC_8'] = 'stuff'; 
$list['D_1']['DD_2']['DDD_3']['DDDD_4']['DDDDD_5'] = 'stuff';

Normally I would do my desired unset()-ing with

unset( $list['A_1']['AA_2']['AAA_3'] );
unset( $list['B_1']['BB_2']['BBB_3'] );
unset( $list['C_1']['CC_2']['CCC_3']['CCCC_4']['CCCCC_5'] );
unset( $list['D_1']['DD_2']['DDD_3']['DDDD_4'] );

However I'd like to get the same result by unsetting them using the elements from another array:

$result = array('A_1','AA_2','AAA_3');
$result = array('B_1','BB_2','BBB_3');
$result = array('C_1','CC_2','CCC_3','CCCC_4','CCCCC_5');
$result = array('D_1','DD_2','DDD_3','DDDD_4');

I've tried to approach it with the simplest way I could imagine but sadly it's not as easy as that and doesn't work:

$result = array('A_1','AA_2','AAA_3');    
unset( $list[$result] );

returns: Warning: Illegal offset type in unset

Vo Kim Nguyen · Accepted Answer · 2015-12-10 09:35:29Z

1

This should be worked

function unsetArray(&$list, $result) {
    eval("unset("."\$list['".implode("']['", $result)."']".");");
}
unsetArray($list, $result);
var_dump($list);

answered Dec 10, 2015 at 9:35

Vo Kim Nguyen

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1 Comment

EDP Over a year ago

TBH I was hoping for something more sophisticated (read: non-eval) but it does do the job. Thanks for that! Small note for others though, don't forget to sanitize the elements of $list or Eval can become Evil in a snap of a finger.

vikram mistry · Accepted Answer · 2015-12-10 08:47:25Z

0

You need to form multidemensional array to unset. Here you are using single dimensional array. Just form array inside array in your result array.

Thanks.

answered Dec 10, 2015 at 8:47

vikram mistry

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