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Conversion

2018-06-24 : Java StringEscapeUtils.escapeJava() made garbage in the database and the string is t\u00B0 %-\u00A3\u03C0.

Some solutions

/* 1 with json_decode */
$s = 't\u00B0 %-\u00A3\u03C0';
echo json_decode('"' . $s . '"');

/* 2 with mbstring */
$s = 't\u00B0 %-\u00A3\u03C0';
echo preg_replace_callback("/\\\\u([A-F0-9]{4})/", function ($a) { return mb_convert_encoding('&#x'.$a[1].';', 'UTF-8', 'HTML-ENTITIES'); }, $s);

/* 3 with IntlChr */
$s = 't\u00B0 %-\u00A3\u03C0';
echo preg_replace_callback("/\\\\u([A-F0-9]{4})/", function ($a) { return IntlChar::chr(hexdec($a[1])); }, $s);

Of course, since escapeJava() will escape \n, \r, " and others characters, json_decode will decode the most of it.