Php recursive array counting - php

Question

I'm trying to write a function which counts array elements recursively.
But result is false.
What could it be problem?
$schema = array(
'div' => array(
'class' => 'lines',
'div' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Soap'
),
'layer' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Ball'
)
)
);
function count_r($array, $i = 0){
foreach($array as $k){
if(is_array($k)){ $i += count_r($k, count($k)); }
else{ $i++; }
}
return $i;
}
echo count_r($schema);

Answer 1

This is the second result on Google so I'm adding this as a reference. There is already a built-in function in PHP that you can use: count().
You can use it like this:
count($schema, COUNT_RECURSIVE);
This function can also detect recursion to avoid infinite loops so it's safer than solutions in other answers.

Answer 2

PHP has a built-in method for this purpose, called count(). If passed without any additional parameters, count() returns the number of array keys on the first level. But, if you pass a second parameter to the count method count( $schema, true ), then the result will be the total number of keys in the multi-dimensional array. The response marked as correct only iterates first and second level arrays, if you have a third child in that array, it will not return the correct answer.
This could be written as a recursive function, if you really want to write your own count() method, though.

Answer 3

Transferred from comment below answer:
Basically, as you're adding the count_r of that array to the current level, you don't need to factor in the count in the second argument - you'd basically be adding it twice. You need the "1" in there, however, to count the array itself. If you'd want to count just the elements and not the arrays, you would just make the "1" a "0".
$schema = array(
'div' => array(
'class' => 'lines',
'div' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Soap'
),
'layer' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Ball'
)
)
);
function count_r($array, $i = 0){
foreach($array as $k){
if(is_array($k)){ $i += count_r($k, 1); }
else{ $i++; }
}
return $i;
}
echo count_r($schema);
This is tested and works correctly.

Answer 4

your function could be simple as
function count_r($array, $i = 0){
foreach($array as $k){
$i++;
if(is_array($k)){
$i += count_r($k);
}
}
return $i;
}

Answer 5

I have altered you code.. Please check it. It is working fine.
$schema = array(
'div' => array(
'class' => 'lines',
'div' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Soap'
),
'layer' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Ball'
)
)
);
function count_r($array){
foreach($array as $k){
if(is_array($k)){
$i += count_r($k);
}
else{
$i++;
}
}
return $i;
}
echo count_r($schema);

Answer 6

If you want to count specific keys/values you can use the built-in array_walk_recursive with a closure function.
$schema = array(
'div' => array(
'class' => 'lines',
'div' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Soap'
),
'layer' => array(
'span' => array(
'key' => 'Product Name'
),
'val' => 'Ball'
)
)
);
$elements = 0;
array_walk_recursive($schema, function($value, $key) use (&$elements) {
if (strstr($value, 'Product')) $elements++;
});
print $elements; // 2
/*
Values
lines
Product Name
Soap
Product Name
Ball
Keys
class
key
val
key
val
*/

Answer 7

count($array, COUNT_RECURSIVE)-count($array)