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 8.7% of the 17756 total user notes.
Notes | Page -------+--------------------------------------------------------- 104 | http://php.net/manual/en/ref.session.php 92 | http://php.net/manual/en/function.strtotime.php 89 | http://php.net/manual/en/function.preg-match.php 87 | http://php.net/manual/en/ref.image.php 84 | http://php.net/manual/en/features.file-upload.php 83 | http://php.net/manual/en/function.fsockopen.php 79 | http://php.net/manual/en/ref.array.php 78 | http://php.net/manual/en/function.rand.php 78 | http://php.net/manual/en/function.array-search.php 77 | http://php.net/manual/en/function.preg-replace.php 76 | http://php.net/manual/en/function.fgetcsv.php 73 | http://php.net/manual/en/reserved.variables.php 72 | http://php.net/manual/en/function.date.php 72 | http://php.net/manual/en/ref.curl.php 70 | http://php.net/manual/en/function.in-array.php 69 | http://php.net/manual/en/function.mssql-connect.php 69 | http://php.net/manual/en/function.strpos.php 68 | http://php.net/manual/en/ref.com.php 64 | http://php.net/manual/en/ref.datetime.php 63 | http://php.net/manual/en/function.array-unique.php