php比较关键字字符串

我需要用php比较这两个关键字字符串

$original_keywords = cat, dog, mouse

$possible_keywords_1 = "cat, dog, hamster";       
$possible_keywords_2 = "cat, sheep, goat"; 

我需要一个php脚本来将数字值“1”分配给第一个可能的字符串（1个匹配项），将数字值“2”分配给第二个可能的字符串（2个匹配项）。有人能帮我吗

$original_keywords = array("cat", "dog", "mouse");
$possible_keywords1 = preg_split('/,\s*/', "cat, dog, hamster");
echo count(array_intersect($original_keywords, $possible_keywords1))

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您可以使用和的组合

以下是要开始的代码：

$possible_keywords_1_array = explode(",", $possible_keywords_1); 
$possible_keywords_2_array = explode(",", $possible_keywords_2); 
$matches = count(array_intersect($possible_keywords_1_array, $possible_keywords_2_array)); 

$possible_keywords_1_array = explode(",", $possible_keywords_1); 
$possible_keywords_2_array = explode(",", $possible_keywords_2); 
$matches = count(array_intersect($possible_keywords_1_array, $possible_keywords_2_array));