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, 2 days ago
with count i mean a numeric count of the only integer-based keys, so for this example the result is 2. — hans, 2 days ago
possible duplicate of PHP: How to use array_filter() to filter array keys? — LaughDonor, 2 days ago

Phil · Accepted Answer · 2014-04-03 22:03:11Z

up vote 1 down vote accepted

To count the integer keys, try

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

answered 2 days ago

Phil
43.9k54263

LaughDonor · Answer 2 · 2014-04-03 22:02:59Z

up vote 1 down vote

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 2 days ago

LaughDonor
980215

Technically, OP only wants to match integer keys. is_numeric will match decimal numbers too – Phil 2 days ago

Sure, I guess it all depends on OP's implementation. – LaughDonor 2 days ago

p.s.w.g · Answer 3 · 2014-04-03 22:03:12Z

up vote 1 down vote

Here's a simple solution:

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

answered 2 days ago

p.s.w.g
67.7k145995

3 Answers