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@ 2019-04-26T18:37:11Z

<?php

$keyword = "москва, питер, саратов";
$keyword_array = explode(',', $keyword);
$text = "здравствуй, саратов!";

foreach ($keyword_array as $keys) {

	if (mb_stripos($text, $keys) !== false) {

		echo "Нашел что-то";

	} 
}

Output
Performance
VLD
References
Branches

explode: documentation ( source)
mb_stripos: documentation ( source)

preferences:dark modelive preview

25.62 ms | 402 KiB | 5 Q