如果两个短语包含相同的单词，请检查php

Question

I want to check if two Phrase contain same word with PHP I'm using strpos and strstr but is not working for me because I don't know exactly the position of the word.

example :

Thismyfirstword
checkfirstmore

In two words, there exists a word ' first ' that means it is true .

do you have any idea?

More Explain

i have two table and i well make loup to check if a phrases contain the same word like this :

1. Table one containe :

   wordone - thatistrue- youknowho- mynamesis - moreexmple - Thismyfirstword

2. Table two containe :

nothinghere - checkfirstmore - thatwatineed -moremore- younameslike

Result

Thismyfirstword = checkfirstmore ( first )
and

mynamesis = younameslike ( names )

moreexmple = moremore ( more )

Answer 1

I think this is what you're looking for. It will return "TRUE" if both have some common word of minimum length 3 as you mentioned in the comment.

    $str1 = "Crazyworld";
    $str2 = "Helloworld";
    echo "This is ".check($str1, $str2);
    function check($string1, $string2)
    {
        for($i = 0; $i <= strlen($string1) - 3;  $i++)
        {
            $sub = substr($string1, $i, 3);
            if(strpos($string2, $sub) !== false){
                return "TRUE";
            }
        }
        return "FALSE";
    }

Answer 2

strpos($string1, 'first');

if it returns 0 or greater than 0 then it means word match.

else, not matched

if(strpos($string1, 'first') > -1){
    echo "Found";
}else{
    echo "Not Found";
}

So you can check for string2 too.