The operators seciot of the online PHP Manual omits mention of:

  {} -- used to extarct a particular character from a string (with an aside about using {} to embed variable values in strings);

  [] -- the array subscriptor (which is actually listed inthe operator precedence table, though mentioned nowhere else);

  -> -- the object property/method accessor;

  & -- the reference operator (also listed in the precendence table, though never explained elsewhere);

  => -- the array key-to-value keyword (not techniclly an operator, I know, but because it's so "punctuation-y", probably a good thing to comment on in this section).

Also, the operators precendence table at http://www.php.net/manual/en/language.operators.precedence.php should probably hyperlink each operator to the appropriate page describing it.

And finally, it might make more sense to put the operator precendence information (including the new and improved table with hyperlinks) right on the first page of the operators section (rather than the arithmentic operators information).