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 13.9% of the 5506 total user notes.
Notes | Page -------+--------------------------------------------------------- 95 | http://php.net/manual/en/function.setcookie.php 74 | http://php.net/manual/en/ref.session.php 49 | http://php.net/manual/en/language.oop.php 42 | http://php.net/manual/en/ref.image.php 42 | http://php.net/manual/en/ref.datetime.php 41 | http://php.net/manual/en/ref.pdf.php 38 | http://php.net/manual/en/ref.imap.php 37 | http://php.net/manual/en/function.preg-replace.php 36 | http://php.net/manual/en/function.include.php 33 | http://php.net/manual/en/function.exec.php 32 | http://php.net/manual/en/function.fopen.php 30 | http://php.net/manual/en/function.odbc-connect.php 28 | http://php.net/manual/en/ref.oci8.php 28 | http://php.net/manual/en/function.mail.php 28 | http://php.net/manual/en/features.file-upload.php 28 | http://php.net/manual/en/ref.domxml.php 27 | http://php.net/manual/en/ref.xslt.php 26 | http://php.net/manual/en/function.imagegif.php 25 | http://php.net/manual/en/function.str-replace.php 25 | http://php.net/manual/en/function.mssql-connect.php