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@ 2014-01-15T18:53:15Z

<?php
    $input='a³';

    $text=str_replace("\n\n",  "z000"        ,$input);
    $text=str_replace("\n",    "z111"        ,$text);
    $text=filter_var($text,FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_STRIP_LOW);
    $text=str_replace("z000",  "<br/><br/>"  ,$text);
    $text=str_replace("z111",  "<br/>"       ,$text);
    echo $text;

Output
Performance
VLD
References
Branches

filter_var: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

36.46 ms | 402 KiB | 5 Q