find value in array and unset it

hi everyone,

i have an array "$book['BookAttachment']" like this:
==================

Array
(
[0] => Array
(
[title] =>
[name] => booking.pdf

)

[1] => Array
(
[title] =>
[name] => DSC_6576.JPG

)

[2] => Array
(
[title] =>
[name] => tt.JPG

)

)

now i wanna go through that array and find a value that is defined in
a passed variable "$filename". once it found it i want to unset that
part of the array. but i cant get it to work.... this is my approach

foreach(array_values($book['BookAttachment']) as $key => $attachment)
{
if($attachment['name'] == $filename)
{
$arrayKeyToDelete = $key;
}
}
unset($book['BookAttachment'][$arrayKeyToDelete]);

the problem is "$key" wont point at the correct array index that is to
be unset. i think it returns the iteration number and not the index..

so how do i make sure that i delete the correct array, where filename
was found?

i appreciate it. thank you!!!!

kind regrads

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