upgrade.phpは、PHP4.xのサーバーでPHP5の関数を使いたい場合に、非常に便利なPHPファイルです。
現時点のZen-Cartでは、PHP5.xだと動作が怪しいので、PHP4.xで動作している方が多いでしょうから覚えておくと後で役に立つかもしれません。

基本的な使い方は、非常に簡単です。
http://upgradephp.berlios.de/からダウンロードしたupgrade.phpを適当なディレクトリへアップし
[code lang=”php”]

[/code]
とするだけで、OK。Zen-Cartの場合は、
includes/functions/extra_functions/
にアップロードするだけで自動的に読み込まれます。

これにより以下の関数が使えるようになるようです。(v15-READMEより)

ｷ json_encode
ｷ json_decode
ｷ strptime
ｷ gzdecode
ｷ htmlspecialchars_decode
ｷ fputcsv
ｷ ob_get_headers
ｷ xmlentities
ｷ stripos
ｷ strripos
ｷ str_ireplace
ｷ get_headers
ｷ headers_list
ｷ fprintf
ｷ vfprintf
ｷ str_split
ｷ http_build_query
ｷ convert_uuencode
ｷ convert_uudecode
ｷ scandir
ｷ idate
ｷ time_nanosleep
ｷ strpbrk
ｷ php_real_logo_guid
ｷ php_egg_logo_guid
ｷ get_declared_interfaces
ｷ array_combine
ｷ array_walk_recursive
ｷ substr_compare
ｷ spl_classes
ｷ class_parents
ｷ session_commit
ｷ dns_check_record
ｷ dns_get_mx
ｷ setrawcookie
ｷ file_put_contents
ｷ count_recursive
ｷ file_get_contents
ｷ fnmatch
ｷ glob
ｷ array_key_exists
ｷ array_intersect_assoc
ｷ array_diff_assoc
ｷ html_entity_decode
ｷ str_word_count
ｷ str_shuffle
ｷ get_include_path
ｷ set_include_path
ｷ restore_include_path
ｷ str_rot13
ｷ array_change_key_case
ｷ array_fill
ｷ array_chunk
ｷ md5_file
ｷ is_a
ｷ fmod
ｷ floatval
ｷ is_infinite
ｷ is_nan
ｷ is_finite
ｷ var_export
ｷ strcoll
ｷ diskfreespace
ｷ disktotalspace
ｷ vprintf
ｷ vsprintf
ｷ import_request_variables
ｷ hypot
ｷ log1p
ｷ expm1
ｷ sinh
ｷ cosh
ｷ tanh
ｷ asinh
ｷ acosh
ｷ atanh
ｷ mhash
ｷ mhash_count
ｷ mhash_get_hash_name
ｷ mhash_get_block_size
ｷ array_udiff_uassoc
ｷ array_udiff_assoc
ｷ array_diff_uassoc
ｷ array_udiff
ｷ array_uintersect_uassoc
ｷ array_uintersect_assoc
ｷ array_uintersect
ｷ array_intersect_uassoc
ｷ dc___exec
ｷ bcscale
ｷ bcadd
ｷ bcsub
ｷ bcmul
ｷ bcdiv
ｷ bcmod
ｷ bcpow
ｷ bcpowmod
ｷ bcsqrt
ｷ bccomp
ｷ bc___scaledown
ｷ gettext
ｷ gettext___plural_guess
ｷ ngettext
ｷ dngettext
ｷ dcngettext
ｷ dcgettext
ｷ dgettext
ｷ textdomain
ｷ bindtextdomain
ｷ gettext___load_mo
ｷ gettext___load_po
ｷ bind_textdomain_codeset
ｷ _
ｷ mime_content_type
ｷ image_type_to_mime_type
ｷ image_type_to_extension
ｷ exif_imagetype
ｷ array_filter
ｷ array_map
ｷ is_callable
ｷ array_search
ｷ array_reduce
ｷ is_scalar
ｷ localeconv
ｷ call_user_func_array
ｷ call_user_method_array
ｷ array_sum
ｷ constant
ｷ is_null
ｷ pathinfo
ｷ escapeshellarg
ｷ is_uploaded_file
ｷ move_uploaded_file
ｷ strncasecmp
ｷ wordwrap
ｷ php_uname
ｷ php_sapi_name
ｷ posix_mkfifo
ｷ posix_getcwd
ｷ posix_kill
ｷ posix_uname
ｷ ctype_alnum
ｷ ctype_alpha
ｷ ctype_digit
ｷ ctype_xdigit
ｷ ctype_cntrl
ｷ ctype_space
ｷ ctype_upper
ｷ ctype_lower
ｷ ctype_graph
ｷ ctype_punct
ｷ ctype_print
ｷ odbc_connect
ｷ odbc_pconnect
ｷ odbc_close
ｷ odbc_exec
ｷ odbc_do
ｷ odbc_prepare
ｷ odbc_execute
ｷ odbc_fetch_array
ｷ odbc_fetch_row
ｷ odbc_fetch_object
ｷ odbc_fetch_into
ｷ odbc_free_result
ｷ odbc_next_result
ｷ odbc_num_fields
ｷ odbc_num_rows