I currently have two arrays:
$array1 = array("Option 1", "Option 2", "Option 3", "Option 4");
$array2 = array("Option 2", "Option 3", "Option 8");
I want to see which values in $array2 can be found in $array1. If there is a value in $array2 which can be found in $array1 (eg. Option 2), I want to change the value of that item to something different (eg. Confirmed). In addition, I want to preserve the order of the items in $array2.
foreach($array2 as &$value) {
if(in_array($value,$array1)) {
$value = 'Confirmed';
}
}
You can use the array_intersect.
A clearer example of the key preservation of this function:
<?php
$array1 = array(2, 4, 6, 8, 10, 12);
$array2 = array(1, 2, 3, 4, 5, 6);
var_dump(array_intersect($array1, $array2));
var_dump(array_intersect($array2, $array1));
?>
result:
array(3) {
[0]=> int(2)
[1]=> int(4)
[2]=> int(6)
}
array(3) {
[1]=> int(2)
[3]=> int(4)
[5]=> int(6)
}
This makes it important to remember which way round you passed the arrays to the function.
You can see more at: http://php.net/manual/en/function.array-intersect.php
You can use array_map function, mapping all the values to see which correspond in $array1 and return the message you want, or return the regular values:
$array2 = array_map(function($a) use ($array1) {
if (in_array($a, $array1)){
return "confirmed";
}
return $a;
}, $array2);
print_r($array2);
Output:
Array
(
[0] => confirmed
[1] => confirmed
[2] => Option 8
)
