我想在段落中找到一个单词的第一个字母的strpos

int strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )

$paragraph = "This is a sample paragraph.";
$word = "sample";
$position = strpos($paragraph, $word);

if ($position !== false) {
    echo "The first letter of the word '$word' is at position $position.";
} else {
    echo "The word '$word' was not found in the paragraph.";
}

The first letter of the word 'sample' is at position 10.