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 9.1% of the 14089 total user notes.
Notes | Page -------+--------------------------------------------------------- 98 | http://php.net/manual/en/function.date.php 88 | http://php.net/manual/en/function.header.php 77 | http://php.net/manual/en/function.preg-replace.php 77 | http://php.net/manual/en/ref.xml.php 72 | http://php.net/manual/en/ref.image.php 65 | http://php.net/manual/en/ref.session.php 64 | http://php.net/manual/en/function.mktime.php 62 | http://php.net/manual/en/reserved.variables.php 61 | http://php.net/manual/en/function.mssql-connect.php 61 | http://php.net/manual/en/features.file-upload.php 59 | http://php.net/manual/en/function.fsockopen.php 59 | http://php.net/manual/en/function.strtotime.php 58 | http://php.net/manual/en/function.explode.php 58 | http://php.net/manual/en/function.readdir.php 57 | http://php.net/manual/en/ref.com.php 57 | http://php.net/manual/en/function.strpos.php 56 | http://php.net/manual/en/function.str-replace.php 54 | http://php.net/manual/en/function.exec.php 52 | http://php.net/manual/en/function.array-search.php 52 | http://php.net/manual/en/function.in-array.php