Following are the top 20 pages of the manual, sorted by the number of user notes contributed. These sections could use a polish, those notes represent 6.7% of the 25032 total user notes.
Notes | Page -------+--------------------------------------------------------- 114 | http://php.net/manual/en/function.curl-setopt.php 105 | http://php.net/manual/en/function.strtotime.php 105 | http://php.net/manual/en/function.date.php 95 | http://php.net/manual/en/function.session-start.php 89 | http://php.net/manual/en/function.array-search.php 87 | http://php.net/manual/en/function.array-merge.php 87 | http://php.net/manual/en/function.number-format.php 87 | http://php.net/manual/en/function.mail.php 85 | http://php.net/manual/en/features.http-auth.php 84 | http://php.net/manual/en/function.serialize.php 81 | http://php.net/manual/en/function.substr.php 81 | http://php.net/manual/en/function.exec.php 74 | http://php.net/manual/en/function.preg-replace.php 74 | http://php.net/manual/en/function.fsockopen.php 74 | http://php.net/manual/en/install.windows.php 73 | http://php.net/manual/en/language.oop5.overloading.php 73 | http://php.net/manual/en/function.xml-parse-into-struct.php 73 | http://php.net/manual/en/function.setcookie.php 73 | http://php.net/manual/en/function.glob.php 72 | http://php.net/manual/en/function.implode.php