JSMin_PHP Library Port

[eluser]runrun[/eluser]
I got a string like so

Lego (trademarked in capitals as LEGO) is a line of <a title="Construction toy" href="#">construction toys</a> manufactured by the <a title="Lego Group" href="#">Lego Group</a>, a privately held company based in <a title="Billund, Denmark" href="#">Billund, Denmark</a>. The company's flagship product, Lego, consists of colorful interlocking plastic bricks and an accompanying array of gears, <a title="Minifigure" href="#">minifigures</a> and various other parts. Lego bricks can be assembled and connected in many ways, to construct such objects as vehicles, buildings, and even working robots. Anything constructed can then be taken apart again, and the pieces used to make other objects. The toys were originally designed in the 1940s in Denmark[1] and have achieved an international appeal, with an extensive subculture that supports Lego movies, games, video games, competitions, and four Lego themed amusement parks.

When I try to minify it with php jsmin, I got "500 internal server error". What's special about that string that jsmin can't parse ?