php: extracting substring from the string by sub-substring

Question

We have some string $text="Here are some text. The word is inside of the second sentence.";and $word="word";

How to get $sentence="The word is inside of the second sentence"; - the first sentence that contains " ".$word." "

Of course some assumptions should be made. One of them is that all sentences are finished with ".\r\n" or "!\r\n" or ". " or "! ".

P.S. We are sure strpos($text," ".$word." ")!==false

Answer 1

Your text:

$txt = "word word word different. different word word word. word word word ending. word word word";

My word is 'different':

$word = "different";

Let us do a preg match:

$c=preg_match("/(\.|^)([^\.]*?".$word."[^\.]*(\.|$))/",$txt,$match);

If it is successful show the second group which holds the sentence:

if($c!==false and count($match) > 0 )
    echo( $match[2]) ;

This will return the first occurence. If you want all use preg_match_all.