php array_column with unsequential index returns wrong index [duplicate]

Question

So I have an array in php like this:

array(
  22 => array()
  23 => array()
  25 => array()
)

I am using array_column in search_array to search a column in the sub arrays.

$index=array_search('needlehere',array_column(myarray,'columnbeingsearchedhere'))

But the array_column is not using the correct indexes, but reindexing them to be 0,1,2...

Is there anyway to keep the correct indexes?

array_combine workaround won't work if some of the subsets in your array don't have the specified column(array_column will dump those instead of return NULL). — kwak
– kwak, Commented Feb 23, 2017 at 9:59
Most directly, use array_find_key(): Get the first level key of the first row containing a specified column value in a 2d array — mickmackusa
– mickmackusa ♦, Commented Mar 19 at 8:11

Mark Baker · Accepted Answer · 2016-05-17 08:36:23Z

3

array_column() doesn't maintain indexes (although it allows you to set your own from other data columns in the row), but you can handle that using something like:

array_combine(
    array_keys($myarray),
    array_column($myarray,'columnbeingsearchedhere')
);

EDIT

Alternative, that probably grabs a bit more memory temporarily (unless you don't mind the original array being modified), but might be a bit faster overall (depending on your data):

$newArray = $myArray;
array_walk($newArray, function(&$value) use ($columnName) { $value = $value[$columnName]; } );

edited May 17, 2016 at 8:36

answered May 17, 2016 at 8:20

Mark Baker

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3 Comments

PixelPaul Over a year ago

this is a possible work around but i guess the overhead would be a lot more and might just be worth doing a simple loop through.

Lucas Cave Over a year ago

The comment of PixelPaul has to be promoted to answer because doing a loop seems the only meaningful way to address the problem!

mickmackusa Mar 19 at 8:07

See array_map() on the dupe target -- that's what I would use for this task.

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