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How to search array of string in another string in PHP?

First, I want to report that I need the inverse PHP function in_array.

I need to search for all the elements of the array in a string, if any of them is found, the function will return true, otherwise return false.

I need the fastest solution to this problem, of course, this can be done by iterating through the array and using the strpos function.

Any suggestions are welcome.

Sample data:

$string = 'Alice goes to school every day'; $searchWords = array('basket','school','tree');

returns true

 $string = 'Alice goes to school every day'; $searchWords = array('basket','cat','tree');

returns false

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7 answers

You should try with preg_match:

 if (preg_match('/' . implode('|', $searchWords) . '/', $string)) return true;

After some comments here is a properly shielded solution:

 function contains($string, Array $search, $caseInsensitive = false) { $exp = '/' . implode('|', array_map('preg_quote', $search)) . ($caseInsensitive ? '/i' : '/'); return preg_match($exp, $string) ? true : false; }
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If a line can be exploded using a space, the following will work:

 var_dump(array_intersect(explode(' ', $str), $searchWords) != null);

OUTPUT: for the two examples you provided:

 bool(true) bool(false)

Update:

If a line cannot be exploded using a space character, use code like this to split the line into any character at the end of the word :

 var_dump(array_intersect(preg_split('~\b~', $str), $searchWords) != null);
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 function searchWords($string,$words) { foreach($words as $word) { if(stristr($string," " . $word . " ")) //spaces either side to force a word { return true; } } return false; }

Using:

 $string = 'Alice goes to school every day'; $searchWords = array('basket','cat','tree'); if(searchWords($string,$searchWords)) { //matches }

Also note that the stristr function is used for case insensitivity

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According to the malko example, but with the correct output of values.

 function contains( $string, array $search ) { return 0 !== preg_match( '/' . implode( '|', preg_quote( $search, '/' ) ) . '/', $string ); }
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try the following:

 $string = 'Alice goes to school every day'; $words = split(" ", $string); $searchWords = array('basket','school','tree'); for($x = 0,$l = count($words); $x < $l;) { if(in_array($words[$x++], $searchWords)) { //.... } }
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There is always a discussion about which is faster, so I decided to run several tests using different methods.

Test run:

  • Strpos
  • preg_match with foreach loop
  • preg_match with regex or
  • indexed search with string to explode
  • indexed search as an array (string already blown)

Two sets of tests that run. One on a large text document (114,350 words) and one on a small text document (120 words). In each set, all tests were performed 100 times, and then the average value was taken. The tests did not ignore the case, which would make them faster. The test for which the index was searched was pre-indexed. I wrote code to index myself, and I'm sure it was less efficient, but indexing for a large file took 17.92 seconds and for a small file 0.001 seconds.

Search terms: gazerbeam (not found in the document), legal (found in the document) and target (NOT found in the document).

Results in seconds to complete one test, sorted by speed:

Large file:

  • 0.0000455808639526 (index without explosions)
  • 0.0009979915618897 (preg_match using regex or)
  • 0.0011657214164734 (strpos)
  • 0.0023632574081421 (preg_match using foreach loop)
  • 0.0051533532142639 (index with an explosion)

Small file

  • 0.000003724098205566 (strpos)
  • 0.000005958080291748 (preg_match using regex or)
  • 0.000012607574462891 (preg_match using foreach loop)
  • 0.000021204948425293 (index without explosions)
  • 0.000060625076293945 (index with an explosion)

Note that strpos is faster than preg_match (using regex or) for small files, but slower for large files. Of course, other factors will affect this, such as the number of searches.

Algorithms Used:

 //strpos $str = file_get_contents('text.txt'); $t = microtime(true); foreach ($search as $word) if (strpos($str, $word)) break; $strpos += microtime(true) - $t; //preg_match $str = file_get_contents('text.txt'); $t = microtime(true); foreach ($search as $word) if (preg_match('/' . preg_quote($word) . '/', $str)) break; $pregmatch += microtime(true) - $t; //preg_match (regex or) $str = file_get_contents('text.txt'); $orstr = preg_quote(implode('|', $search)); $t = microtime(true); if preg_match('/' . $orstr . '/', $str) {}; $pregmatchor += microtime(true) - $t; //index with explode $str = file_get_contents('textindex.txt'); $t = microtime(true); $ar = explode(" ", $str); foreach ($search as $word) { $start = 0; $end = count($ar); do { $diff = $end - $start; $pos = floor($diff / 2) + $start; $temp = $ar[$pos]; if ($word < $temp) { $end = $pos; } elseif ($word > $temp) { $start = $pos + 1; } elseif ($temp == $word) { $found = 'true'; break; } } while ($diff > 0); } $indexwith += microtime(true) - $t; //index without explode (already in array) $str = file_get_contents('textindex.txt'); $found = 'false'; $ar = explode(" ", $str); $t = microtime(true); foreach ($search as $word) { $start = 0; $end = count($ar); do { $diff = $end - $start; $pos = floor($diff / 2) + $start; $temp = $ar[$pos]; if ($word < $temp) { $end = $pos; } elseif ($word > $temp) { $start = $pos + 1; } elseif ($temp == $word) { $found = 'true'; break; } } while ($diff > 0); } $indexwithout += microtime(true) - $t;
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The link below will help you: you just need to configure as you need.

Check if array element exists in string

configured:

 function result_arrayInString($prdterms,208){ if(arrayInString($prdterms,208)){ return true; }else{ return false; } }

This may be useful for you.

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