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 6.7% of the 23258 total user notes.
Notes | Page -------+--------------------------------------------------------- 135 | http://php.net/manual/en/function.curl-setopt.php 98 | http://php.net/manual/en/function.session-start.php 92 | http://php.net/manual/en/function.exec.php 89 | http://php.net/manual/en/function.mail.php 82 | http://php.net/manual/en/function.strtotime.php 81 | http://php.net/manual/en/function.header.php 75 | http://php.net/manual/en/function.array-search.php 74 | http://php.net/manual/en/features.http-auth.php 74 | http://php.net/manual/en/function.xml-parse-into-struct.php 73 | http://php.net/manual/en/function.imagejpeg.php 72 | http://php.net/manual/en/function.number-format.php 71 | http://php.net/manual/en/control-structures.switch.php 68 | http://php.net/manual/en/function.mssql-connect.php 68 | http://php.net/manual/en/language.oop5.decon.php 68 | http://php.net/manual/en/function.glob.php 68 | http://php.net/manual/en/features.commandline.php 67 | http://php.net/manual/en/function.array-merge.php 67 | http://php.net/manual/en/function.imagecopyresampled.php 65 | http://php.net/manual/en/function.set-error-handler.php 65 | http://php.net/manual/en/function.shell-exec.php