I am trying to count the matches between expected and actual in a PHP array, I have this…
$array = array(
"item" => array(
'expected' => array(
'1' => 25,
'2' => 4,
'3' => 4,
),
'color' => 'red',
'actual' => array(
'1' => 25,
'2' => 4,
'3' => 3,
),
),
);
foreach ($array as $key => $arrayItem) {
$matches = array (
'matches' => count ( array_intersect ( $arrayItem['expected'], $arrayItem['actual'] ) ),
);
}
echo "Matches = " . $matches['matches'];
I am expecting this to return 2 but it is actually returning 3. If I change the values like in the example below then it does work…
$array = array(
"item" => array(
'expected' => array(
'1' => 25,
'2' => 84,
'3' => 4,
),
'color' => 'red',
'actual' => array(
'1' => 25,
'2' => 84,
'3' => 3,
),
),
);
foreach ($array as $key => $arrayItem) {
$matches = array (
'matches' => count ( array_intersect ( $arrayItem['expected'], $arrayItem['actual'] ) ),
);
}
echo "Matches = " . $matches['matches'];
Anyone any ideas why the top version is not giving me the expected result?
Because it returns an array containing all values in array1 whose values exist in all of the parameters.
array_intersect(array $array1, array $array2[, array $... ]): array
https://www.php.net/manual/en/function.array-intersect.php
Maybe you can see it clearly from this perspective:
var_dump(array_intersect([25, 4, 4, 4], [25, 4, 3])); // [25, 4, 4, 4]
// because the number `4` is in the second array!
var_dump(array_intersect([25, 4, 3], [25, 4, 4, 4])); // [25, 4]
Answer：
The count is actually correct.
It doesn’t happen in your second example because you use the numbers 84 and 4, but essentially here are the matches:
$arrayItem['expected'][1] matches with $arrayItem['actual'][1] (25 and 25)
$arrayItem['expected'][2] matches with $arrayItem['actual'][2] (4 and 4)
$arrayItem['expected'][3] matches with $arrayItem['actual'][2] (4 and 4)
The count of 3 is correct.
You can test this by changing your code to the following:
$matches = array(
'matches' => array_intersect ($arrayItem['expected'], $arrayItem['actual'])
);
var_dump($matches);
Here you’ll see this output:
array(1) {
["matches"] => array(3) {
[1]=> int(25)
[2]=> int(4)
[3]=> int(4)
}
}
Answer：
it returns 2
<?php
$array = array(
"item" => array(
'expected' => array(
'1' => 25,
'2' => 84,
'3' => 4,
),
'color' => 'red',
'actual' => array(
'1' => 25,
'2' => 84,
'3' => 3,
),
),
);
echo count(array_intersect($array['item']['expected'],$array['item']['actual']));
