The rest of this book provides an alphabetical summary of the
functions that are available in PHP. The synopsis for each function
lists the expected argument types for the function, its return type,
and the version of PHP in which the function was introduced. The
possible types are
mixed means that the argument or return type can
be of any type. Optional arguments are shown in square brackets. Note
that PHP didn't start tracking version numbers for
functions until PHP 3.0, so functions that are listed as 3.0 are
likely to have existed in Version 2.x.
As of PHP 4.3, approximately 2,750 functions came bundled with PHP. The bulk of these are in optional extensions. Out of these functions, I selected 1,404 for this pocket reference. Even with close to half the functions cut, I'm still pushing the limits of what the average pocket can hold without busting a few seams. Here's a list of the function groups that survived the cut, followed by the ones that didn't:
Apache, array, assert, aspell/pspell, base64, bcmath, bz2, calendar, crack, crc32, crypt, ctype, curl, date/time, dba, db, dbx, directory, DNS, exec, exif, file, ftp, gd, gettext, gmp, HTML, iconv, imap, iptc, java, lcg, ldap, link, mail, math, md5, mbstring, mcrypt, mhash, MySQL, Oracle 8, PDF, Perl regex, PostgreSQL, Posix, process control, recode, session, shmop, snmp, sockets, various standard built-in, syslog, SYSV shared mem/sem/msg, xml, xslt, zip, zlib. ...