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 6.8% of the 23503 total user notes.
Notes | Page -------+--------------------------------------------------------- 105 | http://php.net/manual/en/function.date.php 100 | http://php.net/manual/en/function.curl-setopt.php 92 | http://php.net/manual/en/function.strtotime.php 86 | http://php.net/manual/en/function.session-start.php 83 | http://php.net/manual/en/function.array-merge.php 81 | http://php.net/manual/en/features.http-auth.php 80 | http://php.net/manual/en/function.number-format.php 80 | http://php.net/manual/en/function.serialize.php 79 | http://php.net/manual/en/function.array-search.php 78 | http://php.net/manual/en/function.mail.php 75 | http://php.net/manual/en/function.array-unique.php 74 | http://php.net/manual/en/function.session-set-save-handler.php 74 | http://php.net/manual/en/function.substr.php 73 | http://php.net/manual/en/features.file-upload.php 73 | http://php.net/manual/en/function.fsockopen.php 73 | http://php.net/manual/en/install.windows.php 73 | http://php.net/manual/en/function.xml-parse-into-struct.php 72 | http://php.net/manual/en/function.exec.php 72 | http://php.net/manual/en/function.usort.php 71 | http://php.net/manual/en/language.oop5.patterns.php