3v4l.org

run code in 300+ PHP versions simultaneously
<?php $xmlFile = "<Font html:Face=\"Arial\" x:Family=\"Swiss\" html:Color=\"#000000\">"; $xmlFile = preg_replace('/<Font(\s+.+)>/', '<Font $1 xmlns="http://www.w3.org/TR/REC-html40">', $xmlFile); var_dump($xmlFile);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.3.6
string(110) "<Font html:Face="Arial" x:Family="Swiss" html:Color="#000000" xmlns="http://www.w3.org/TR/REC-html40">"

preferences:
212.26 ms | 406 KiB | 397 Q