require_once( 'DatabaseFunctions.php' );
-require_once( 'UpdateClasses.php' );
require_once( 'LogPage.php' );
require_once( 'normal/UtfNormalUtil.php' );
+require_once( 'XmlFunctions.php' );
/**
* Compatibility functions
}
}
-// If it doesn't exist no ctype_* stuff will
-if ( ! function_exists( 'ctype_alnum' ) )
- require_once 'compatability/ctype.php';
/**
* Wrapper for clone() for PHP 4, for the moment.
* We want / and : to be included as literal characters in our title URLs.
* %2F in the page titles seems to fatally break for some reason.
*
- * @param string $s
+ * @param $s String:
* @return string
*/
function wfUrlencode ( $s ) {
* $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
* $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
*
- * @param string $text
- * @param bool $logonly Set true to avoid appearing in HTML when $wgDebugComments is set
+ * @param $text String
+ * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
*/
function wfDebug( $text, $logonly = false ) {
global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
* Send a line to a supplementary debug log file, if configured, or main debug log if not.
* $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
*
- * @param string $logGroup
- * @param string $text
- * @param bool $public Whether to log the event in the public log if no private
+ * @param $logGroup String
+ * @param $text String
+ * @param $public Bool: whether to log the event in the public log if no private
* log file is specified, (default true)
*/
function wfDebugLog( $logGroup, $text, $public = true ) {
/**
* Log for database errors
- * @param string $text Database error message.
+ * @param $text String: database error message.
*/
function wfLogDBError( $text ) {
global $wgDBerrorLog;
global $wgProfiling, $wgUser;
$now = wfTime();
- list( $usec, $sec ) = explode( ' ', $wgRequestTime );
- $start = (float)$sec + (float)$usec;
- $elapsed = $now - $start;
+ $elapsed = $now - $wgRequestTime;
if ( $wgProfiling ) {
- $prof = wfGetProfilingOutput( $start, $elapsed );
+ $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
$forward = '';
if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
$forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
* addWikiText will do the escaping for you. Use wfMsgHtml()
* if you need an escaped message.
*
- * @param string lookup key for the message, usually
+ * @param $key String: lookup key for the message, usually
* defined in languages/Language.php
*/
function wfMsg( $key ) {
* customize over 70 messages in order to, e.g., fix a link in every
* possible language.
*
- * @param string lookup key for the message, usually
+ * @param $key String: lookup key for the message, usually
* defined in languages/Language.php
*/
function wfMsgForContent( $key ) {
/**
* Really get a message
+ * @return $key String: key to get.
+ * @return $args
+ * @return $useDB Boolean
+ * @return String: the requested message.
*/
-function wfMsgReal( $key, $args, $useDB, $forContent=false, $transform = true ) {
+function wfMsgReal( $key, $args, $useDB = true, $forContent=false, $transform = true ) {
$fname = 'wfMsgReal';
$message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
}
/**
- * This function provides the message source for messages to be edited which are *not* stored in the database
-*/
-
+ * This function provides the message source for messages to be edited which are *not* stored in the database.
+ * @param $key String:
+ */
function wfMsgWeirdKey ( $key ) {
$subsource = str_replace ( ' ' , '_' , $key ) ;
$source = wfMsg ( $subsource ) ;
* @param bool $useDB
* @param bool $forContent
* @return string
- * @access private
+ * @private
*/
function wfMsgGetKey( $key, $useDB, $forContent = false, $transform = true ) {
global $wgParser, $wgMsgParserOptions, $wgContLang, $wgMessageCache, $wgLang;
* @param string $message
* @param array $args
* @return string
- * @access private
+ * @private
*/
function wfMsgReplaceArgs( $message, $args ) {
# Fix windows line-endings
return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
}
+/**
+ * Returns message in the requested format
+ * @param string $key Key of the message
+ * @param array $options Processing rules:
+ * <i>parse<i>: parses wikitext to html
+ * <i>parseinline<i>: parses wikitext to html and removes the surrounding p's added by parser or tidy
+ * <i>escape<i>: filters message trough htmlspecialchars
+ * <i>replaceafter<i>: parameters are substituted after parsing or escaping
+ */
+function wfMsgExt( $key, $options ) {
+ global $wgOut, $wgMsgParserOptions, $wgParser;
+
+ $args = func_get_args();
+ array_shift( $args );
+ array_shift( $args );
+
+ if( !is_array($options) ) {
+ $options = array($options);
+ }
+
+ $string = wfMsgGetKey( $key, true, false, false );
+
+ if( !in_array('replaceafter', $options) ) {
+ $string = wfMsgReplaceArgs( $string, $args );
+ }
+
+ if( in_array('parse', $options) ) {
+ $string = $wgOut->parse( $string, true, true );
+ } elseif ( in_array('parseinline', $options) ) {
+ $string = $wgOut->parse( $string, true, true );
+ $m = array();
+ if( preg_match( "~^<p>(.*)\n?</p>$~", $string, $m ) ) {
+ $string = $m[1];
+ }
+ } elseif ( in_array('parsemag', $options) ) {
+ global $wgTitle;
+ $parser = new Parser();
+ $parserOptions = new ParserOptions();
+ $parserOptions->setInterfaceMessage( true );
+ $parser->startExternalParse( $wgTitle, $parserOptions, OT_MSG );
+ $string = $parser->transformMsg( $string, $parserOptions );
+ }
+
+ if ( in_array('escape', $options) ) {
+ $string = htmlspecialchars ( $string );
+ }
+
+ if( in_array('replaceafter', $options) ) {
+ $string = wfMsgReplaceArgs( $string, $args );
+ }
+
+ return $string;
+}
+
+
/**
* Just like exit() but makes a note of it.
* Commits open transactions except if the error parameter is set
+ *
+ * @obsolete Please return control to the caller or throw an exception
*/
function wfAbruptExit( $error = false ){
global $wgLoadBalancer;
}
/**
- * @todo document
+ * @obsolete Please return control the caller or throw an exception
*/
function wfErrorExit() {
wfAbruptExit( true );
*/
function wfDie( $msg='' ) {
echo $msg;
- die( -1 );
+ die( 1 );
}
/**
- * Die with a backtrace
- * This is meant as a debugging aid to track down where bad data comes from.
- * Shouldn't be used in production code except maybe in "shouldn't happen" areas.
+ * Throw a debugging exception. This function previously once exited the process,
+ * but now throws an exception instead, with similar results.
*
* @param string $msg Message shown when dieing.
*/
function wfDebugDieBacktrace( $msg = '' ) {
- global $wgCommandLineMode;
+ throw new MWException( $msg );
+}
- $backtrace = wfBacktrace();
- if ( $backtrace !== false ) {
- if ( $wgCommandLineMode ) {
- $msg .= "\nBacktrace:\n$backtrace";
- } else {
- $msg .= "\n<p>Backtrace:</p>\n$backtrace";
- }
+/**
+ * Fetch server name for use in error reporting etc.
+ * Use real server name if available, so we know which machine
+ * in a server farm generated the current page.
+ * @return string
+ */
+function wfHostname() {
+ if ( function_exists( 'posix_uname' ) ) {
+ // This function not present on Windows
+ $uname = @posix_uname();
+ } else {
+ $uname = false;
+ }
+ if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
+ return $uname['nodename'];
+ } else {
+ # This may be a virtual server.
+ return $_SERVER['SERVER_NAME'];
}
- echo $msg;
- echo wfReportTime()."\n";
- die( -1 );
}
/**
global $wgRequestTime;
$now = wfTime();
- list( $usec, $sec ) = explode( ' ', $wgRequestTime );
- $start = (float)$sec + (float)$usec;
- $elapsed = $now - $start;
-
- # Use real server name if available, so we know which machine
- # in a server farm generated the current page.
- if ( function_exists( 'posix_uname' ) ) {
- $uname = @posix_uname();
- } else {
- $uname = false;
- }
- if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
- $hostname = $uname['nodename'];
- } else {
- # This may be a virtual server.
- $hostname = $_SERVER['SERVER_NAME'];
- }
- $com = sprintf( "<!-- Served by %s in %01.2f secs. -->",
- $hostname, $elapsed );
+ $elapsed = $now - $wgRequestTime;
+
+ $com = sprintf( "<!-- Served by %s in %01.3f secs. -->",
+ wfHostname(), $elapsed );
return $com;
}
}
/**
- * Yay, more global functions!
+ * Obtain the offset and limit values from the request string;
+ * used in special pages
+ *
+ * @param $deflimit Default limit if none supplied
+ * @param $optionname Name of a user preference to check against
+ * @return array
+ *
*/
function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
global $wgRequest;
return $out;
}
-/**
- * Returns an escaped string suitable for inclusion in a string literal
- * for JavaScript source code.
- * Illegal control characters are assumed not to be present.
- *
- * @param string $string
- * @return string
- */
-function wfEscapeJsString( $string ) {
- // See ECMA 262 section 7.8.4 for string literal format
- $pairs = array(
- "\\" => "\\\\",
- "\"" => "\\\"",
- '\'' => '\\\'',
- "\n" => "\\n",
- "\r" => "\\r",
-
- # To avoid closing the element or CDATA section
- "<" => "\\x3c",
- ">" => "\\x3e",
- );
- return strtr( $string, $pairs );
-}
/**
* @todo document
* @return float
*/
function wfTime() {
- $st = explode( ' ', microtime() );
- return (float)$st[0] + (float)$st[1];
-}
-
-/**
- * Changes the first character to an HTML entity
- */
-function wfHtmlEscapeFirst( $text ) {
- $ord = ord($text);
- $newText = substr($text, 1);
- return "&#$ord;$newText";
+ return microtime(true);
}
/**
}
$delim = !$delim;
}
- // Double the backslashes before the end of the string, because
+ // Double the backslashes before the end of the string, because
// we will soon add a quote
if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
$arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
* @param string $type
* @param array $avail
* @return string
- * @access private
+ * @private
*/
function mimeTypeMatch( $type, $avail ) {
if( array_key_exists($type, $avail) ) {
/**
* An Exif timestamp (YYYY:MM:DD HH:MM:SS)
*
- * @link http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
+ * @url http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
* DateTime tag and page 36 for the DateTimeOriginal and
* DateTimeDigitized tags.
*/
/**
* @param mixed $outputtype A timestamp in one of the supported formats, the
- * function will autodetect which format is supplied
- and act accordingly.
+ * function will autodetect which format is supplied
+ * and act accordingly.
* @return string Time in the format specified in $outputtype
*/
function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
$uts = 0;
+ $da = array();
if ($ts==0) {
$uts=time();
} elseif (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
case TS_ORACLE:
return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
default:
- wfDebugDieBacktrace( 'wfTimestamp() called with illegal output type.');
+ throw new MWException( 'wfTimestamp() called with illegal output type.');
}
}
global $wgUser, $wgSiteNotice;
$fname = 'wfGetSiteNotice';
wfProfileIn( $fname );
+ $siteNotice = '';
- if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
- $siteNotice = wfGetCachedNotice( 'sitenotice' );
- $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
- } else {
- $anonNotice = wfGetCachedNotice( 'anonnotice' );
- if( !$anonNotice ) {
+ if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
+ if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
$siteNotice = wfGetCachedNotice( 'sitenotice' );
$siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
} else {
- $siteNotice = $anonNotice;
+ $anonNotice = wfGetCachedNotice( 'anonnotice' );
+ if( !$anonNotice ) {
+ $siteNotice = wfGetCachedNotice( 'sitenotice' );
+ $siteNotice = !$siteNotice ? $wgSiteNotice : $siteNotice;
+ } else {
+ $siteNotice = $anonNotice;
+ }
}
}
+ wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
wfProfileOut( $fname );
- return( $siteNotice );
-}
-
-/**
- * Format an XML element with given attributes and, optionally, text content.
- * Element and attribute names are assumed to be ready for literal inclusion.
- * Strings are assumed to not contain XML-illegal characters; special
- * characters (<, >, &) are escaped but illegals are not touched.
- *
- * @param string $element
- * @param array $attribs Name=>value pairs. Values will be escaped.
- * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
- * @return string
- */
-function wfElement( $element, $attribs = null, $contents = '') {
- $out = '<' . $element;
- if( !is_null( $attribs ) ) {
- foreach( $attribs as $name => $val ) {
- $out .= ' ' . $name . '="' . htmlspecialchars( $val ) . '"';
- }
- }
- if( is_null( $contents ) ) {
- $out .= '>';
- } else {
- if( $contents == '' ) {
- $out .= ' />';
- } else {
- $out .= '>' . htmlspecialchars( $contents ) . "</$element>";
- }
- }
- return $out;
-}
-
-/**
- * Format an XML element as with wfElement(), but run text through the
- * UtfNormal::cleanUp() validator first to ensure that no invalid UTF-8
- * is passed.
- *
- * @param string $element
- * @param array $attribs Name=>value pairs. Values will be escaped.
- * @param string $contents NULL to make an open tag only; '' for a contentless closed tag (default)
- * @return string
- */
-function wfElementClean( $element, $attribs = array(), $contents = '') {
- if( $attribs ) {
- $attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
- }
- if( $contents ) {
- $contents = UtfNormal::cleanUp( $contents );
- }
- return wfElement( $element, $attribs, $contents );
-}
-
-// Shortcuts
-function wfOpenElement( $element, $attribs = null ) { return wfElement( $element, $attribs, null ); }
-function wfCloseElement( $element ) { return "</$element>"; }
-
-/**
- * Create a namespace selector
- *
- * @param mixed $selected The namespace which should be selected, default ''
- * @param string $allnamespaces Value of a special item denoting all namespaces. Null to not include (default)
- * @return Html string containing the namespace selector
- */
-function &HTMLnamespaceselector($selected = '', $allnamespaces = null) {
- global $wgContLang;
- if( $selected !== '' ) {
- if( is_null( $selected ) ) {
- // No namespace selected; let exact match work without hitting Main
- $selected = '';
- } else {
- // Let input be numeric strings without breaking the empty match.
- $selected = intval( $selected );
- }
- }
- $s = "<select id='namespace' name='namespace' class='namespaceselector'>\n\t";
- $arr = $wgContLang->getFormattedNamespaces();
- if( !is_null($allnamespaces) ) {
- $arr = array($allnamespaces => wfMsgHtml('namespacesall')) + $arr;
- }
- foreach ($arr as $index => $name) {
- if ($index < NS_MAIN) continue;
-
- $name = $index !== 0 ? $name : wfMsgHtml('blanknamespace');
-
- if ($index === $selected) {
- $s .= wfElement("option",
- array("value" => $index, "selected" => "selected"),
- $name);
- } else {
- $s .= wfElement("option", array("value" => $index), $name);
- }
- }
- $s .= "\n</select>\n";
- return $s;
+ return $siteNotice;
}
/** Global singleton instance of MimeMagic. This is initialized on demand,
* please always use the wfGetMimeMagic() function to get the instance.
*
-* @access private
+* @private
*/
$wgMimeMagic= NULL;
*/
function wfIncrStats( $key ) {
global $wgDBname, $wgMemc;
- /* LIVE HACK AVOID MEMCACHED ACCESSES DURING HIGH LOAD */
- if ($wgDBname != 'enwiki' and $wgDBname != 'dewiki' and $wgDBname != 'commonswiki' and $wgDBname != 'testwiki')
- return true;
- static $socket;
- if (!$socket) {
- $socket=socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
- $statline="{$wgDBname} - 1 1 1 1 1 -total\n";
- socket_sendto($socket,$statline,strlen($statline),0,"webster","3811");
- }
- $statline="{$wgDBname} - 1 1 1 1 1 {$key}\n";
- socket_sendto($socket,$statline,strlen($statline),0,"webster","3811");
- return true;
-
$key = "$wgDBname:stats:$key";
if ( is_null( $wgMemc->incr( $key ) ) ) {
$wgMemc->add( $key, 1 );
*/
function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
if ( is_null( $changed ) ) {
- wfDebugDieBacktrace('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
+ throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
}
if ( $default[$key] !== $value ) {
$changed[$key] = $value;
return strpos( $str, $needle ) !== false;
}
+function wfSpecialList( $page, $details ) {
+ global $wgContLang;
+ $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
+ return $page . $details;
+}
+
/**
* Returns a regular expression of url protocols
*
function wfUrlProtocols() {
global $wgUrlProtocols;
- // Support old-style $wgUrlProtocols strings, for backwards compatibility
+ // Support old-style $wgUrlProtocols strings, for backwards compatibility
// with LocalSettings files from 1.5
if ( is_array( $wgUrlProtocols ) ) {
$protocols = array();
}
/**
- * Check if a string is well-formed XML.
- * Must include the surrounding tag.
- *
- * @param string $text
- * @return bool
- *
- * @todo Error position reporting return
+ * Execute a shell command, with time and memory limits mirrored from the PHP
+ * configuration if supported.
+ * @param $cmd Command line, properly escaped for shell.
+ * @param &$retval optional, will receive the program's exit code.
+ * (non-zero is usually failure)
+ * @return collected stdout as a string (trailing newlines stripped)
*/
-function wfIsWellFormedXml( $text ) {
- $parser = xml_parser_create( "UTF-8" );
-
- # case folding violates XML standard, turn it off
- xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
-
- if( !xml_parse( $parser, $text, true ) ) {
- $err = xml_error_string( xml_get_error_code( $parser ) );
- $position = xml_get_current_byte_index( $parser );
- //$fragment = $this->extractFragment( $html, $position );
- //$this->mXmlError = "$err at byte $position:\n$fragment";
- xml_parser_free( $parser );
- return false;
+function wfShellExec( $cmd, &$retval=null ) {
+ global $IP, $wgMaxShellMemory;
+
+ if( ini_get( 'safe_mode' ) ) {
+ wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
+ $retval = 1;
+ return "Unable to run external programs in safe mode.";
}
- xml_parser_free( $parser );
- return true;
-}
-
-/**
- * Check if a string is a well-formed XML fragment.
- * Wraps fragment in an <html> bit and doctype, so it can be a fragment
- * and can use HTML named entities.
- *
- * @param string $text
- * @return bool
- */
-function wfIsWellFormedXmlFragment( $text ) {
- $html =
- Sanitizer::hackDocType() .
- '<html>' .
- $text .
- '</html>';
- return wfIsWellFormedXml( $html );
-}
-
-/**
- * shell_exec() with time and memory limits mirrored from the PHP configuration,
- * if supported.
- */
-function wfShellExec( $cmd )
-{
- global $IP;
if ( php_uname( 's' ) == 'Linux' ) {
$time = ini_get( 'max_execution_time' );
- $mem = ini_get( 'memory_limit' );
- if( preg_match( '/^([0-9]+)[Mm]$/', trim( $mem ), $m ) ) {
- $mem = intval( $m[1] * (1024*1024) );
- }
+ $mem = intval( $wgMaxShellMemory );
+
if ( $time > 0 && $mem > 0 ) {
$script = "$IP/bin/ulimit.sh";
if ( is_executable( $script ) ) {
- $memKB = intval( $mem / 1024 );
- $cmd = escapeshellarg( $script ) . " $time $memKB $cmd";
+ $cmd = escapeshellarg( $script ) . " $time $mem $cmd";
}
}
} elseif ( php_uname( 's' ) == 'Windows NT' ) {
# http://news.php.net/php.internals/21796
$cmd = '"' . $cmd . '"';
}
- return shell_exec( $cmd );
+ wfDebug( "wfShellExec: $cmd\n" );
+
+ $output = array();
+ $retval = 1; // error by default?
+ $lastline = exec( $cmd, $output, $retval );
+ return implode( "\n", $output );
+
}
/**
$php_ver = PHP_VERSION;
if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
- wfDebugDieBacktrace( "PHP $req_ver required--this is only $php_ver" );
+ throw new MWException( "PHP $req_ver required--this is only $php_ver" );
}
/**
global $wgVersion;
if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
- wfDebugDieBacktrace( "MediaWiki $req_ver required--this is only $wgVersion" );
+ throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
}
/**
function wfDoUpdates()
{
global $wgPostCommitUpdateList, $wgDeferredUpdateList;
- foreach ( $wgDeferredUpdateList as $update ) {
+ foreach ( $wgDeferredUpdateList as $update ) {
$update->doUpdate();
}
foreach ( $wgPostCommitUpdateList as $update ) {
$wgPostCommitUpdateList = array();
}
+/**
+ * More or less "markup-safe" explode()
+ * Ignores any instances of the separator inside <...>
+ * @param string $separator
+ * @param string $text
+ * @return array
+ */
+function wfExplodeMarkup( $separator, $text ) {
+ $placeholder = "\x00";
+
+ // Just in case...
+ $text = str_replace( $placeholder, '', $text );
+
+ // Trim stuff
+ $replacer = new ReplacerCallback( $separator, $placeholder );
+ $cleaned = preg_replace_callback( '/(<.*?>)/', array( $replacer, 'go' ), $text );
+
+ $items = explode( $separator, $cleaned );
+ foreach( $items as $i => $str ) {
+ $items[$i] = str_replace( $placeholder, $separator, $str );
+ }
+
+ return $items;
+}
+
+class ReplacerCallback {
+ function ReplacerCallback( $from, $to ) {
+ $this->from = $from;
+ $this->to = $to;
+ }
+
+ function go( $matches ) {
+ return str_replace( $this->from, $this->to, $matches[1] );
+ }
+}
+
+
+/**
+ * Convert an arbitrarily-long digit string from one numeric base
+ * to another, optionally zero-padding to a minimum column width.
+ *
+ * Supports base 2 through 36; digit values 10-36 are represented
+ * as lowercase letters a-z. Input is case-insensitive.
+ *
+ * @param $input string of digits
+ * @param $sourceBase int 2-36
+ * @param $destBase int 2-36
+ * @param $pad int 1 or greater
+ * @return string or false on invalid input
+ */
+function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1 ) {
+ if( $sourceBase < 2 ||
+ $sourceBase > 36 ||
+ $destBase < 2 ||
+ $destBase > 36 ||
+ $pad < 1 ||
+ $sourceBase != intval( $sourceBase ) ||
+ $destBase != intval( $destBase ) ||
+ $pad != intval( $pad ) ||
+ !is_string( $input ) ||
+ $input == '' ) {
+ return false;
+ }
+
+ $digitChars = '0123456789abcdefghijklmnopqrstuvwxyz';
+ $inDigits = array();
+ $outChars = '';
+
+ // Decode and validate input string
+ $input = strtolower( $input );
+ for( $i = 0; $i < strlen( $input ); $i++ ) {
+ $n = strpos( $digitChars, $input{$i} );
+ if( $n === false || $n > $sourceBase ) {
+ return false;
+ }
+ $inDigits[] = $n;
+ }
+
+ // Iterate over the input, modulo-ing out an output digit
+ // at a time until input is gone.
+ while( count( $inDigits ) ) {
+ $work = 0;
+ $workDigits = array();
+
+ // Long division...
+ foreach( $inDigits as $digit ) {
+ $work *= $sourceBase;
+ $work += $digit;
+
+ if( $work < $destBase ) {
+ // Gonna need to pull another digit.
+ if( count( $workDigits ) ) {
+ // Avoid zero-padding; this lets us find
+ // the end of the input very easily when
+ // length drops to zero.
+ $workDigits[] = 0;
+ }
+ } else {
+ // Finally! Actual division!
+ $workDigits[] = intval( $work / $destBase );
+
+ // Isn't it annoying that most programming languages
+ // don't have a single divide-and-remainder operator,
+ // even though the CPU implements it that way?
+ $work = $work % $destBase;
+ }
+ }
+
+ // All that division leaves us with a remainder,
+ // which is conveniently our next output digit.
+ $outChars .= $digitChars[$work];
+
+ // And we continue!
+ $inDigits = $workDigits;
+ }
+
+ while( strlen( $outChars ) < $pad ) {
+ $outChars .= '0';
+ }
+
+ return strrev( $outChars );
+}
+
?>
dépôts / lhc / web / wiklou.git / blobdiff