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
– sbeliv01, Commented Apr 3, 2014 at 22:01
with count i mean a numeric count of the only integer-based keys, so for this example the result is 2. — user2679304
– user2679304, Commented Apr 3, 2014 at 22:04
possible duplicate of PHP: How to use array_filter() to filter array keys? — Sunny Patel
– Sunny Patel, Commented Apr 3, 2014 at 22:04

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

2

To count the integer keys, try

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

answered Apr 3, 2014 at 22:03

Phil

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Comments

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

2

Here's a simple solution:

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

answered Apr 3, 2014 at 22:03

p.s.w.g

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Sunny Patel · Accepted Answer · 2014-04-03 22:02:59Z

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 3, 2014 at 22:02

Sunny Patel

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Technically, OP only wants to match integer keys. is_numeric will match decimal numbers too

Sure, I guess it all depends on OP's implementation.