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<?php $string = "این متن فارسی است and this is !!! in English این خط بعدی است و this is going to be continued..."; $newStr = preg_replace_callback('/\w.*(?=\w|\b)/', function (array $m) { return implode(" ", array_reverse(explode(" ", $m[0]))); }, $string); echo $newStr;
Output for 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
این متن فارسی است English in !!! is this and این خط بعدی است و continued be to going is this...

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