http://php.net/manual

Language Up-to-date Untranslated
Arabic 0% 99.80%
Brazilian Portuguese 5.19% 89.91%
Chinese 0.39% 98.95%
Czech 1.29% 77.87%
Dutch 7.57% 90.85%
Finnish 0.07% 99.84%
French 0% 28.81%
German 27.36% 45.58%
Hebrew 1.25% 97.11%
Hungarian 18.37% 71.47%
Italian 31.42% 62.78%
Japanese 0% 7.28%
Korean 0% 48.20%
Polish 12.73% 85.82%
Romanian 0% 91.78%
Russian 0% 99.64%
Spanish 3.07% 49.41%
Turkish 0% 99.18%

Manual Notes
There are 7,132 total notes attached to various pages in the manual. The twenty pages (of about 3,000) with the most notes have about 15% of the total notes.
Notes Example
Notes Page
105 http://php.net/manual/en/function.setcookie.php
100 http://php.net/manual/en/ref.session.php
64 http://php.net/manual/en/language.oop.php
59 http://php.net/manual/en/install.apache.php
57 http://php.net/manual/en/function.preg-replace.php
55 http://php.net/manual/en/function.include.php
49 http://php.net/manual/en/ref.imap.php
49 http://php.net/manual/en/function.mail.php
49 http://php.net/manual/en/ref.image.php
48 http://php.net/manual/en/features.file-upload.php
48 http://php.net/manual/en/function.date.php
45 http://php.net/manual/en/ref.pdf.php
44 http://php.net/manual/en/ref.datetime.php
42 http://php.net/manual/en/install.windows.php
41 http://php.net/manual/en/function.exec.php
37 http://php.net/manual/en/language.variables.predefined.php
37 http://php.net/manual/en/function.fopen.php
34 http://php.net/manual/en/faq.installation.php
34 http://php.net/manual/en/function.mssql-connect.php
34 http://php.net/manual/en/ref.oci8.php