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 8.8% of the 15863 total user notes.
Notes | Page -------+--------------------------------------------------------- 90 | http://php.net/manual/en/ref.session.php 83 | http://php.net/manual/en/ref.xml.php 83 | http://php.net/manual/en/function.strtotime.php 82 | http://php.net/manual/en/function.header.php 78 | http://php.net/manual/en/ref.image.php 77 | http://php.net/manual/en/reserved.variables.php 73 | http://php.net/manual/en/function.preg-match.php 71 | http://php.net/manual/en/function.fsockopen.php 70 | http://php.net/manual/en/function.mktime.php 69 | http://php.net/manual/en/features.file-upload.php 67 | http://php.net/manual/en/function.mssql-connect.php 64 | http://php.net/manual/en/function.readdir.php 64 | http://php.net/manual/en/ref.com.php 62 | http://php.net/manual/en/function.array-search.php 61 | http://php.net/manual/en/function.explode.php 60 | http://php.net/manual/en/function.fgetcsv.php 60 | http://php.net/manual/en/function.substr.php 59 | http://php.net/manual/en/function.serialize.php 58 | http://php.net/manual/en/ref.curl.php 58 | http://php.net/manual/en/function.exec.php