<?php $string = <<<STRING PHP is a widely-used general-purpose server side scripting language STRING; $result = []; while (!ctype_space($string)) { $line = []; $string = preg_replace_callback( "~.$|^$~m", function($m) use(&$line) { $line[] = $m[0] === '' ? ' ' : $m[0]; return ''; }, $string, ); array_unshift($result, implode(' ', $line)); } echo implode("\n", $result);
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