Count occurrences of a specific value in multidimensional array - php

Question

Let's say I have a multidimensional array like this:
[
["Thing1", "OtherThing1"],
["Thing1", "OtherThing2"],
["Thing2", "OtherThing3"]
]
How would I be able to count how many times the value "Thing1" occurs in the multidimensional array?

Answer 1

you can use array_search for more information see this http://www.php.net/manual/en/function.array-search.php
this code is sample of this that is in php document sample
<?php
function recursiveArraySearchAll($haystack, $needle, $index = null)
{
$aIt = new RecursiveArrayIterator($haystack);
$it = new RecursiveIteratorIterator($aIt);
$resultkeys;
while($it->valid()) {
if (((isset($index) AND ($it->key() == $index)) OR (!isset($index))) AND (strpos($it->current(), $needle)!==false)) { //$it->current() == $needle
$resultkeys[]=$aIt->key(); //return $aIt->key();
}
$it->next();
}
return $resultkeys; // return all finding in an array
} ;
?>
If needle is found in haystack more than once, the first matching key is returned. To return the keys for all matching values, use array_keys() with the optional search_value parameter instead.
http://www.php.net/manual/en/function.array-keys.php

Answer 2

Try this :
$arr =array(
array("Thing1","OtherThing1"),
array("Thing1","OtherThing2"),
array("Thing2","OtherThing3")
);
echo "<pre>";
$res = array_count_values(call_user_func_array('array_merge', $arr));
echo $res['Thing1'];
Output :
Array
(
[Thing1] => 2
[OtherThing1] => 1
[OtherThing2] => 1
[Thing2] => 1
[OtherThing3] => 1
)
It gives the occurrence of each value. ie : Thing1 occurs 2 times.
EDIT : As per OP's comment : "Which array do you mean resulting array?" - The input array. So for example this would be the input array: array(array(1,1),array(2,1),array(3,2)) , I only want it to count the first values (1,2,3) not the second values (1,1,2) – gdscei 7 mins ago
$arr =array(
array("Thing1","OtherThing1"),
array("Thing1","OtherThing2"),
array("Thing2","OtherThing3")
);
$res = array_count_values(array_map(function($a){return $a[0];}, $arr));
echo $res['Thing1'];

Answer 3

function showCount($arr, $needle, $count=0)
{
// Check if $arr is array. Thx to Waygood
if(!is_array($arr)) return false;
foreach($arr as $k=>$v)
{
// if item is array do recursion
if(is_array($v))
{
$count = showCount($v, $needle, $count);
}
elseif($v == $needle){
$count++;
}
}
return $count;
}

Answer 4

Using in_array can help:
$cont = 0;
//for each array inside the multidimensional one
foreach($multidimensional as $m){
if(in_array('Thing1', $m)){
$cont++;
}
}
echo $cont;
For more info: http://php.net/manual/en/function.in-array.php

Answer 5

try this
$arr =array(
array("Thing1","OtherThing1"),
array("Thing1","OtherThing2"),
array("Thing2","OtherThing3")
);
$abc=array_count_values(call_user_func_array('array_merge', $arr));
echo $abc[Thing1];

Answer 6

$count = 0;
foreach($array as $key => $value)
{
if(in_array("Thing1", $value)) $count++;
}

Answer 7

If you prefer code brevity zero global scope pollution, you can count every value and access the one count that you do want:
echo array_count_values(array_merge(...$array))['Thing1'] ?? 0;
If you don't want to bother counting values where the count will never be needed, then you can visit leafnodes with array_walk_recursive() and +1 everytime the target value is encountered.
$thing1Count = 0;
array_walk_recursive($array, function($v) use(&$thing1Count) { $thing1Count += ($v === 'Thing1'); });
echo $thing1Count;
Both snippets return 2. Here's a Demo.