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<?php $txt = "lookSTARTfromhereSTARTagainhere"; $arr = explode("START", $txt); // Explode on START unset($arr[0]); // first item is before START, we don't need that. $res = []; foreach($arr as $val){ $temp = str_split($val, 4); // Split array item on four letters. $res = array_merge($res, $temp); // merge the new array with result array } var_dump($res);
Output for 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(5) { [0]=> string(4) "from" [1]=> string(4) "here" [2]=> string(4) "agai" [3]=> string(4) "nher" [4]=> string(1) "e" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(5) { [0]=> string(4) "from" [1]=> string(4) "here" [2]=> string(4) "agai" [3]=> string(4) "nher" [4]=> string(1) "e" }

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206.17 ms | 402 KiB | 245 Q