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 8.4% of the 19708 total user notes.
Notes | Page -------+--------------------------------------------------------- 108 | http://php.net/manual/en/function.date.php 105 | http://php.net/manual/en/ref.session.php 93 | http://php.net/manual/en/reserved.variables.php 91 | http://php.net/manual/en/features.file-upload.php 86 | http://php.net/manual/en/ref.image.php 85 | http://php.net/manual/en/function.rand.php 85 | http://php.net/manual/en/function.fgetcsv.php 83 | http://php.net/manual/en/function.mssql-connect.php 82 | http://php.net/manual/en/ref.array.php 82 | http://php.net/manual/en/function.fsockopen.php 82 | http://php.net/manual/en/function.array-search.php 81 | http://php.net/manual/en/function.header.php 79 | http://php.net/manual/en/ref.curl.php 75 | http://php.net/manual/en/ref.datetime.php 74 | http://php.net/manual/en/function.serialize.php 74 | http://php.net/manual/en/function.str-replace.php 74 | http://php.net/manual/en/ref.mail.php 73 | http://php.net/manual/en/function.in-array.php 72 | http://php.net/manual/en/function.array-unique.php 72 | http://php.net/manual/en/control-structures.foreach.php