php - Iterate and Skip All Values Containing The Previous Values - php

Question

I want to check two arrays that contain similar elements. If the element in the second array containing the same element inside the first array, then save it and ignore everything after it that contain that element. And if any element in the second array is not an element of the first array and not contain any element in the first array, then save it too.
It basically is like this:
$array_1 = Array(
[0] => car,
[1] => bike,
[2] => plane,
[3] => ship
);
$array2 = Array(
[0] => tiger_claws,
[1] => bike,
[2] => bike_1,
[3] => bike_30,
[4] => bike_clone,
[5] => bike_sold,
[6] => plane,
[7] => plane_3a,
[8] => plane_fly
);
From the array examples above, I want to take tiger_claws bike and plane into new separated array that will be named $new_array. The actual data I processed is dynamic, so I need a dynamic approach too.
Here is my try to achieve it:
$count = count($array2);
$new_array = array();
for($i=0; $i<$count; $i++ ) {
foreach($array_1 as $arr){
if ($array2[$i] == $arr) {
$new_array[] = $arr;
if (strpos($array2[$i], $arr)){
continue;
}
} elseif (strpos($array2[$i], $arr) === false){
$new_array[] = $arr;
}
}
}
How do I catches the tiger_claws, bike and plane only and then put them into $new_array and leave everything else?
EDIT:
The $array2 may sometimes contain one or more elements that have underscore and that element not containing any string/ element in $array_1.
This thing is very complicated for me. Hope somebody would like to give the correct logic!
Best Regards

Answer 1

$new_array();
foreach ($array2 as $string) {
if (!in_array($string, $array1) &&
!in_array($string, $new_array) &&
!strpos($string, '_')) {
$new_array[] = $string;
}
}
This code loops through $array2 and checks:
if the current array value is in $array1 (if so, ignore it)
if the current array value is already in $new_array (if so, ignore it)
if the underscore '_' is not present in the current array
If so, it is added to $new_array.

Answer 2

Here is the solution I found. Hope someone can benefit from this answer! Please suggest me the more elegant solution if you have it.
First, we check if there are any element of $array_1 that is contained in $array2 and collect them to a new array if there is matched element:
$check = array();
foreach(array2 as $arr){
foreach($array_1 as $arr1){
if($arr == $arr1) {
$check[] = $arr;
}
}
}
Next, do the filtering with the new array created above and save the elements we want into $new_array
$new_array = array();
foreach(array2 as $arr){
foreach($check as $chk){
if($arr == $chk || strpos($arr, $chk) === false) {
$new_array[] = $arr;
}
}
}
Now, the $new_array elements will be:
tiger_claws,
bike,
plane
About strpos. According to my test and the reference here, !strpos($var1, $var2) is not the correct opposite of strpos($var1, $var2). This is an example of the correct way to test if strpos is false:
if(strpos($var1, $var2) === false) {
// do your stuff
}