search words in two arrays - php

Question

I am trying to search two arrays and return the index of matching words that match in array 1 from array 2. following are the arrays:
$array1 = array('hello how are you', 'hello I am fine');
$array2 = array('hello','how');
I am trying the following code and it return 0,1 which is fine. But i only want to return 0. I want it to return only where both words are present in the array.
foreach ($array1 as $reference => $array) {
foreach($array2 as $key => $word) {
if(strpos($array, $word) !== false) {
echo $reference, PHP_EOL;
break;
}
}
}

Answer 1

You need to keep track of each entity from $array2 being checked against each entity from $array1 then compare after the inner loop to decide whether all elements from $array2 are present in $array1. Here's an example:
foreach($array1 as $reference => $array) {
$contains = 0;
foreach($array2 as $key => $word) {
if(strpos($array, $word) !== false) {
$contains++;
} else {
// for performance reasons, e.g. if you have a large array,
// you should break the loop here if the word isn't in the
// original array
break;
}
}
if($contains == count($array2)) {
// $array contains all words from $array2
echo $reference . PHP_EOL;
} else {
// $array doesn't contain all the words
}
}