php count only integer keys of an array

Question

Exist some simple function for count only the integer keys of an array?

for example i have this array:

0 => "string"
1 => "string"
"#aaa" => "string"

I need count only the first two element without using a custom foreach loop.

By 'count' do you mean add/sum or include only integer-based keys? — sbeliv01, Apr 03 '14 at 22:01
with count i mean a numeric count of the only integer-based keys, so for this example the result is 2. — , Apr 03 '14 at 22:04
possible duplicate of [PHP: How to use array\_filter() to filter array keys?](http://stackoverflow.com/questions/4260086/php-how-to-use-array-filter-to-filter-array-keys) — Sunny Patel, Apr 03 '14 at 22:04

score 1 · Answer 1 · answered Apr 03 '14 at 22:02

1

Do a check on each key to loop through only the numbered keys:

foreach( $arr as $key => $value ) {
    if( is_numeric($key) ) { //Only numbered keys will pass
        //Do whatever you want
    }
}

answered Apr 03 '14 at 22:02

Sunny Patel

Technically, OP only wants to match integer keys. `is_numeric` will match decimal numbers too – Phil Apr 03 '14 at 22:09
Sure, I guess it all depends on OP's implementation. – Sunny Patel Apr 03 '14 at 22:11

score 1 · Accepted Answer · answered Apr 03 '14 at 22:03

1

To count the integer keys, try

count(array_filter(array_keys($array), function($key) {
    return is_int($key);
}));

answered Apr 03 '14 at 22:03

Phil

score 1 · Answer 3 · answered Apr 03 '14 at 22:03

1

Here's a simple solution:

$int_keys = count(array_filter(array_keys($arr), 'is_int'));

answered Apr 03 '14 at 22:03

p.s.w.g

3 Answers3