how to using Preg_match for array (multiple key)?

Question

for example, i have these few keywords

$word = "word1,word2,word3";

and substract/explode that using $keyword = explode(",", trim($word)); then ill get these $keyword[0] $keyword[1] and $keyword[2]

now, how to match these keyword using preg_match?

$others = "this is example where there is word1"; 

if(preg_match('/($keyword[0]|$keyword[1]|$keyword[2])/i', $others)){
echo "matched";
}

the problem is, if there is only 2 words, it will matched all the words in $others.

is there any more propper or easier and efficient way to do it?

Do you need to initialize the regex from an array? Try $rx = '/' . implode("|", array_map(function($i) { return preg_quote(trim($i), "/"); }, explode(",", $word))) . '/i';, then use preg_match($rx, $others), see demo. Add word boundaries, \b, on both ends to only match whole words. Or, better, (?<!\w) at the start and (?!\w) at the end. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 28, 2020 at 9:59

Death-is-the-real-truth · Accepted Answer · 2020-03-28 11:41:57Z

1

Use array_intersect() along with explode()

$word = "word1,word2,word3";

$others = "this is example where there is word1"; 


$wordsArray = explode(',',$word);
$othersArray = explode(' ',$others);
if(count(array_intersect($othersArray,$wordsArray)) > 0){
    echo "matched";
}else{
    echo "not matched";
}

Output: https://3v4l.org/2fiTm And https://3v4l.org/vIrnh

if you want case insensitive check then use strtolower():

$wordsArray = explode(',',strtolower($word));
$othersArray = explode(' ',strtolower($others));
if(count(array_intersect($othersArray,$wordsArray)) > 0){

    echo "matched";
}else{
    echo "not matched";
}

Output: https://3v4l.org/tgflb

Note:- I assume that text($others variable) words are separated with white space.

edited Mar 28, 2020 at 11:41

answered Mar 28, 2020 at 10:00

Death-is-the-real-truth

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2 Comments

Tunku Salim Over a year ago

so the $othersArray explode every words? does it takes a long time if the $others has a long sentence? i mean if the $others is long, does is it affect the server?

Death-is-the-real-truth Over a year ago

nope. it needs to be too-too-too-too-too........... long to affect server speed. you can check it here:- 3v4l.org/t4XUG/perf#output

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