check first value/key in array when using in_array function

Question

I have this array of values:

$col_names = array(
                   'Call For?' => 'assigned_to', 
                   'Message' => 'message', 
                   'Name' => 'caller_name', 
                   'Company Name' => 'caller_company', 
                   'Telephone' => 'caller_telephone'
                  );

I then use an in_array function to check if a value is in the above array:

if(in_array(trim(tdrows($node->childNodes)), $col_names)) {

I want to check the first value in the array, for example check Call For? rather than assigned_to

how can i do this?

AlexL · Accepted Answer · 2014-10-29 11:11:47Z

1

Or better yet use array_key_exists(). This is much more efficient then retrieving the entire list of keys and doing an in_array lookup as suggested in sgt's answer:

if(array_key_exists(trim(tdrows($node->childNodes)), $col_names)) {

edited Oct 29, 2014 at 11:11

answered Oct 29, 2014 at 11:02

AlexL

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Comments

Sougata Bose · Accepted Answer · 2014-10-29 11:05:19Z

0

you can you array_flip() which will flip the array.

in_array(trim(tdrows($node->childNodes)), array_flip($col_names))

or if you dont need the values then try with array_keys() which will extract the keys only

in_array(trim(tdrows($node->childNodes)), array_keys($col_names))

answered Oct 29, 2014 at 11:05

Sougata Bose

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2 Comments

AlexL Over a year ago

Not the most efficient way to do it. If he only needs to check the existence of the key it's better to use array_key_exists()

Sougata Bose Over a year ago

yup.. it will be the most efficient. missed this. :) will give you +1..@AlexLinte

Community · Accepted Answer · 2023-11-17 19:53:52Z

0

You can use the array_key_exists

to find if key exists or not. This is better than the in_array method

edited Nov 17, 2023 at 19:53

CommunityBot

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answered Oct 29, 2014 at 11:06

theark

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