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 13138 total user notes.
Notes | Page -------+--------------------------------------------------------- 79 | http://php.net/manual/en/function.header.php 70 | http://php.net/manual/en/function.preg-replace.php 68 | http://php.net/manual/en/function.date.php 63 | http://php.net/manual/en/ref.image.php 63 | http://php.net/manual/en/features.file-upload.php 62 | http://php.net/manual/en/ref.xml.php 60 | http://php.net/manual/en/reserved.variables.php 57 | http://php.net/manual/en/function.mssql-connect.php 57 | http://php.net/manual/en/function.mktime.php 57 | http://php.net/manual/en/function.eval.php 57 | http://php.net/manual/en/function.fopen.php 56 | http://php.net/manual/en/ref.com.php 54 | http://php.net/manual/en/function.fsockopen.php 54 | http://php.net/manual/en/function.readdir.php 52 | http://php.net/manual/en/function.explode.php 51 | http://php.net/manual/en/ref.session.php 51 | http://php.net/manual/en/ref.mail.php 51 | http://php.net/manual/en/function.str-replace.php 50 | http://php.net/manual/en/ref.datetime.php 50 | http://php.net/manual/en/function.exec.php