获得包含特定单词的所有句子

Question

I am trying to get all the sentence from text which contains set of sentences:

Here is my code and

http://ideone.com/fork/O9XtOY

<?php
$var = array('one','of','here','Another');
$str = 'Start of sentence one. This is a wordmatch one two three four! Another, sentence here.';
foreach ($var as $val)
{
    $m =$val; // word 
    $regex = '/[A-Z][^\.\!\;]*('.$m.')[^\.;!]*/';
    //
    if (preg_match($regex, $str, $match))
    {
        echo $match[0];     
        echo "
";
    }
}

1. Why did it not print last sentence twice though I here and Another both appears in it
2. How can I skip sentence in the list if it already present? Want to remove the redundancy. I want to store sentence in some data structure/variable to use all such sentences later

Answer 1

I'd say your approach is a bit too convoluted. It's easier to:

1. first get all sentences,
2. and then filter this set by your criteria.

E.g:

// keywords to search for
$needles = array('one', 'of', 'here', 'Another');

// input text
$text = 'Start of sentence one. This is a wordmatch one two three four! Another, sentence here.';

// get all sentences (the pattern could be too simple though)
if (preg_match_all('/.+?[!.]\s*/', $text, $match)) {

  // select only those fitting the criteria
  $hits = array_filter($match[0], function ($sentence) use($needles) {

    // check each keyword
    foreach ($needles as $needle) {
      // return early on first hit (or-condition)
      if (false !== strpos($sentence, $needle)) {
        return true;
      }
    }

    return false;
  });

  // log output
  print_r($hits);
}

demo: http://ideone.com/pZfOb5

---

Notes regarding:

if (preg_match_all('/.+?[!.]\s*/', $text, $match)) {

About the pattern:

.+?   // select at least one char, ungreedy
[!.]  // until one of the given sentence
      // delimiters is found (could/should be extended as needed)
\s*   // add all following whitespace

---

array_filter($match[0], function ($sentence) use($needles) {

array_filter just does what it's name suggests. It returns a filtered version of the input array (here $match[0]). The supplied callback (the inline function) get's called for each element of the array and should return true/false for whether the current element should be part of the new array. The use-syntax allows access to the $needles-array, which is needed inside the function.