Question

Trying to use array_keys with two levels array but don’t know how:

This does not work:

<?php
$myarray['a'][]='b';

$an_id='b';

$eval="a";
$check=array_keys($myarray,$an_id);

if(in_array($eval,$check)){
echo 'found';
}
?>

Two levels array.

But this does:

<?php
$myarray['a']='b';

$an_id='b';

$eval="a";
$check=array_keys($myarray,$an_id);

if(in_array($eval,$check)){
echo 'found';
}
?>

Single level array.

Answer 1

Your first example does not work because you search b string while $myarray['a'] contains an array with a b string, so just replace your following line:

$an_id='b';

for this one:

$an_id= array('b');

so you search for the correct value inside $myarray, with that change your first example will work.

See working example