PHP Array Search Returns Empty Key

Question

I'm trying to use array_search to find the key of a value in an array, I have the following simple code:

$current_user_existing_shopping_bag_string          = '1446784/-/3/-/£797.00(_)902982/-/4/-/£148.80(_) ';
$current_user_existing_shopping_bag_array           = explode('(_)', $current_user_existing_shopping_bag_string);
$key                                                = array_search($current_user_existing_shopping_bag_array, '902982');
echo $key;

However I have no idea why this doesn't return the key of the value in the array, it should though. I've been trying various solutions for hours now and still no luck.

Anybody able to give me a pointer why this doesn't return the key for the value in the array?

Thanks

array search takes the value (not the array) as first argument. — Ryan
– Ryan, Commented Nov 17, 2014 at 16:07

baldrs · Accepted Answer · 2014-11-17 16:09:13Z

3

It is because array_search compares strings using === operator, not regex or strpos of any kind.

You search for 902982 but string is 902982/-/4/-/£148.80, and therefore they are not equal in any way.

For what you want to achieve, you can use preg_grep:

$result = preg_grep('/' . preg_quote($search) . '/', $current_user_existing_shopping_bag_array);

Then you can get the keys you need from the resulting array.

answered Nov 17, 2014 at 16:09

baldrs

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8 Comments

baldrs Over a year ago

It is only filter-like regex search, and returns array indexed with original keys, so you can just take the keys you found and then delete them from the original array.

user2028856 Over a year ago

Okay, so I'm still a bit confused, the result I get in $result is an array

user2028856 Over a year ago

How I'm I supposed to use the info in this array?

kero Over a year ago

@user2028856 Yes. $result has all elements of the original array with their respective key where the pattern was found (here: the number). So you can do sth like $.._bag_array = array_diff($.._bag_array, $result); to remove them from the original array

baldrs Over a year ago

@user2028856 It contains key-value pairs from the original array, matching string you are searching. RTFM

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