Can't use variable in array_columns as column name

Question

I have a simple array and I want to use array_column but strangely it does not work using a variable as column name.

$colors = array(
array( 'RAL' => 'RAL 1000', 'RGB' => '190,189,127', 'HEX' => 'BEBD7F', 
'NAME' => 'Grünbeige' ),
    array( 'RAL' => 'RAL 1001', 'RGB' => '194,176,120', 'HEX' => 'C2B078', 
'NAME' => 'Beige' ),
    );

$column_name = 'hex'; // this comes actually via $_GET['hex'];

This does not work:

print_r(array_column($colors, ucwords($column_name)));

This does work:

print_r(array_column($colors, 'HEX'));

Seems to work with typos ($column_name vs $colum_name, array_collumns vs. array_column) corrected. 3v4l.org/B7qaT — user3783243
– user3783243, Commented Nov 21, 2018 at 21:01
despite the typos, the problem stays the same. In my real code it's without typos. — Jake
– Jake, Commented Nov 21, 2018 at 21:06
Can you post a reproducible example? As can be seen in demo they both work the same. If array_collumn is not the native array_column function can you please add that definition? 3v4l.org/EuOfb — user3783243
– user3783243, Commented Nov 21, 2018 at 21:09
Ucwords is not the same as strtoupper. Read the manual what ucwords does — Andreas
– Andreas, Commented Nov 21, 2018 at 21:21

Andreas · Accepted Answer · 2018-11-21 21:22:56Z

2

Don't use ucwords. That camelcase the word to Hex.
Use strtoupper.

print_r(array_column($colors, strtoupper($column_name)));

https://3v4l.org/c6cum

answered Nov 21, 2018 at 21:22

Andreas

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