PhpEd helpfully tells you there are syntax errors in the file when you do a re-indent (Alt F6).

Less helpfully it flags these with a tiny red underline which is almost unfindable in any non-trivial file if it is on a single character.

Is there a way to jump to the next syntax error?

This seems like interface design 101, but I have searched high and low in the interface, help, forums and web and found no reference to such a function. Am I just being blind?

Syntax issues should be highlighted with red symbols in the editor right sidebar next to the vertical scrollbar. Clicking on those symbols will jump to the location of the error.