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With 'upgrade.php' on-hand, you can use all features from newer PHP versions (up to 5.2/5.3 currently) without losing compatibility to older interpreters and outdated webserver setups. It takes care of emulating any functions (with their original names) that are missing at runtime.

You just include() it into your applications. Then you are freed from from handling backwards compliance and wasting time with workarounds. Simply use the more powerful PHP functions.

http://upgradephp.berlios.de/

Following functions are currently emulated: json_encode · json_decode · preg_filter · lcfirst · array_replace · strptime · error_get_last · preg_last_error · lchown · lchgrp · gzdecode · ob_get_headers · xmlentities · stripos · strripos · str_ireplace · get_headers · headers_list · fprintf · vfprintf · str_split · http_build_query · convert_uuencode · convert_uudecode · scandir · idate · time_nanosleep · strpbrk · php_real_logo_guid · php_egg_logo_guid · php_strip_whitespace · php_check_syntax · get_declared_interfaces · array_combine · array_walk_recursive · substr_compare · spl_classes · class_parents · session_commit · dns_check_record · dns_get_mx · setrawcookie · file_put_contents · file_get_contents · fnmatch · glob · array_key_exists · array_intersect_assoc · array_diff_assoc · html_entity_decode · str_word_count · str_shuffle · get_include_path · set_include_path · restore_include_path · str_rot13 · array_change_key_case · array_fill · array_chunk · md5_file · is_a · fmod · floatval · is_infinite · is_nan · is_finite · var_export · strcoll · diskfreespace · disktotalspace · vprintf · vsprintf · import_request_variables · hypot · log1p · expm1 · sinh · cosh · tanh · asinh · acosh · atanh · array_udiff_uassoc · array_udiff_assoc · array_diff_uassoc · array_udiff · array_uintersect_uassoc · array_uintersect_assoc · array_uintersect · array_intersect_uassoc · mime_content_type · image_type_to_mime_type · image_type_to_extension · exif_imagetype · array_filter · array_map · is_callable · array_search · array_reduce · is_scalar · localeconv · call_user_func_array · call_user_method_array · array_sum · constant · is_null · pathinfo · escapeshellarg · is_uploaded_file · move_uploaded_file · strncasecmp · wordwrap · php_uname · php_sapi_name

The emulated functions are of course only ever used, if the current PHP interpreter doesn't provide them itself:

So the native functions get called as usual on current setups, while your applications guaranteed work unchanged for anybody else, regardless of PHP version. Only a minimum compatibility requirement of "PHP 4.1" remains.

The upgrade.php package also provides multiple emulation include scripts for larger PHP extensions, like gettext, ftp and ctype, mime functions, odbc, dba.

Of course, the emulated modules don't behave 100% exactly like the original C implementations - but the upgrade.php extensions work much better than common workaround snippets, and should be 'good enough' for most applications.

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