array_map inline anonymous function

Question

I tested inline anonymous function with array_map here

and it worked but when I tried same with $user_meta it is not working.

$user_meta = Array ( [interest] => Array ( [0] => Array ) [type] => 
     Array ( [0] => Array ) [user_status] => Array ( [0] => deny)
     [firstname] => Array ( [0] => ) [lastname] => Array ( [0] => B ) 
     [email] => email@cc.com ) 

$user_meta = array_map(function($a) { return $a[0]; },$user_meta);

"Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in"

here is the test link showing error

Your definition of the $user_meta array is not valid for a PHP array, it's print_r() output, formatted for human readability — Mark Baker, Aug 01 '13 at 14:25
problem in in the email! need to put that in quotes "email@cc.com" — drew7721, Jul 12 '18 at 17:49

Dat TT · Answer 1 · 2018-07-13T02:22:40.773

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I hope this will help:

$user_meta = array_map(function ($a) { return $a[0]; }, $user_meta);

edited Jul 13 '18 at 02:22

answered Mar 17 '17 at 13:42

Dat TT

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This is a good answer, except the remark `there must be a space between the keyword function and its parameters`. Because i removed the space and got no problem. – Fandi Susanto Feb 21 '18 at 05:01
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The space after `function` keyword really doesn't matter...! – betatester07 Jun 28 '18 at 11:03
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The space changes nothing. – drew7721 Jul 12 '18 at 17:50
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Yes, the syntax seems fine. There error should be from $user_meta definition. – Dat TT Jul 13 '18 at 02:19

score 18 · Answer 2 · answered Aug 01 '13 at 14:25

18

There's nothing wrong with the array_map line, but everything before it is wrong. That is the output of a print_r not PHP code. Compare how you define the array in the two links you posted.

answered Aug 01 '13 at 14:25

Paul

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I am getting same error when I pass the array with arguments..I could only make it work by calling function explicitly.. [here](http://3v4l.org/F0Sac) – B L Praveen Aug 02 '13 at 10:43
Which version of PHP do you have? Most people have at least 5.3 now, and you're code worked fine in 5.3 and up. – Paul Aug 02 '13 at 13:14
I am using php 5.5 only you can check the updated link..again it is showing errors – B L Praveen Aug 02 '13 at 13:55
@BLPraveen There are no errors in the section titled: `Output for 5.3.0 - 5.5.1`. Only in the older version sections. – Paul Aug 02 '13 at 15:10
@BLPraveen Added some output so you can see that's it's working: http://3v4l.org/5NgCc – Paul Aug 02 '13 at 15:11
The array syntax is fine... `array('0' => '')` is just going to define an associative array with a key '0' pointing to an empty string. The error's almost certainly just that he's on a PHP version older than 5.3. – George Sep 02 '16 at 05:44

score 8 · Answer 3 · answered Jan 10 '22 at 02:06

8

Slightly shorter could be

$user_meta = array_map(fn ($a) => $a[0], $user_meta);

But I would prefer the array_column approach for such an array_map

answered Jan 10 '22 at 02:06

Igbanam

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score 3 · Answer 4 · answered Dec 19 '18 at 16:32

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That's not an answer to your question, but since you want to return the first key of each sub-array, you can just use array_column.

$user_meta = array_column($user_meta, 0);

answered Dec 19 '18 at 16:32

Hichem Benali

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array_map inline anonymous function

4 Answers4