Remove empty array elements with array_filter with a callback function

Question

I'm trying to delete empty elements in an array with the function array_filter.

When i use an external callback like this :

function callback($a) { return !empty($a);}
$arr = array("abc",'','ghi');
$res = array_filter($arr, "callback");

it works as expected.

But if i use array_filter like that :

$arr = array("abc",'','ghi');
$res = array_filter($arr, function($a) { return !empty($a);});

It fails with the error :

PHP Parse error:  syntax error, unexpected T_FUNCTION in test.php on line 2

What am i doing wrong ?

Gumbo · Accepted Answer · 2010-09-03 13:01:49Z

15

It seems that you’re using a PHP version that does not support anonymous functions (available since PHP 5.3.0).

But array_filter does already filter empty values if you don’t specify a callback function:

If no callback is supplied, all entries of input equal to FALSE (see converting to boolean) will be removed.

answered Sep 3, 2010 at 13:01

Gumbo

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1 Comment

Wil Moore III Over a year ago

Just a note that without a callback and input like $arr = array("abc",'','ghi', ' '); the last item will not be filtered out since array_filter will not trim the input.

Adrian Toman · Accepted Answer · 2012-06-15 03:45:18Z

0

It works well with PHP5. Check your PHP version, and upgrade if necessary.

edited Jun 15, 2012 at 3:45

Adrian Toman

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answered Sep 3, 2010 at 13:06

Pramendra Gupta

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1 Comment

Toto Over a year ago

I have php 5.1.6 and can't upgrade :-(

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