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<?php $textbefore = "text has newlines in wo\nrds and normal newlines \n bewtween words and again in wo\nrds"; $textafter = preg_replace( "/(?<=\S)\n|\n(?=\S)/", '', $textbefore); var_dump( $textafter);
Output for 4.3.0 - 5.6.3, php7@20140507 - 20141101, hhvm-3.1.0, hhvm-3.3.0 - 3.4.1
string(82) "text has newlines in words and normal newlines bewtween words and again in words"
Output for hhvm-3.0.1, hhvm-3.2.0

Process exited with code 153.