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moodlelib.php
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moodlelib.php
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<?PHP // $Id$
//
// moodlelib.php
//
// Large collection of useful functions used by many parts of Moodle.
//
// Martin Dougiamas, 2000
//
/// STANDARD WEB PAGE PARTS ///////////////////////////////////////////////////
function print_header ($title="", $heading="", $navigation="", $focus="", $meta="", $cache=true, $button=" ", $menu="") {
// $title - appears top of window
// $heading - appears top of page
// $navigation - premade navigation string
// $focus - indicates form element eg inputform.password
// $meta - meta tags in the header
// $cache - should this page be cacheable?
// $button - HTML code for a button (usually for module editing)
// $menu - HTML code for a popup menu
global $USER, $CFG, $THEME;
if (file_exists("$CFG->dirroot/theme/$CFG->theme/styles.php")) {
$styles = $CFG->stylesheet;
} else {
$styles = "$CFG->wwwroot/theme/standard/styles.php";
}
if ($navigation == "home") {
$home = true;
$navigation = "";
}
if ($button == "") {
$button = " ";
}
if (!$menu and $navigation) {
if (isset($USER->id)) {
$menu = "<FONT SIZE=2><A TARGET=_parent HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A></FONT>";
} else {
$menu = "<FONT SIZE=2><A TARGET=_parent HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A></FONT>";
}
}
// Specify character set ... default is iso-8859-1 but some languages might need something else
// Could be optimised by carrying the charset variable around in $USER
if (current_language() == "en") {
$meta .= "<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=iso-8859-1\">\n";
} else {
$meta .= "<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=".get_string("thischarset")."\">\n";
}
if ($CFG->langdir == "RTL") {
$direction = " DIR=\"RTL\"";
} else {
$direction = " DIR=\"LTR\"";
}
if (!$cache) { // Do everything we can to prevent clients and proxies caching
@header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
@header("Pragma: no-cache");
$meta .= "\n<META HTTP-EQUIV=\"Pragma\" CONTENT=\"no-cache\">";
$meta .= "\n<META HTTP-EQUIV=\"Expires\" CONTENT=\"0\">";
}
include ("$CFG->dirroot/theme/$CFG->theme/header.html");
}
function print_footer ($course=NULL) {
// Can provide a course object to make the footer contain a link to
// to the course home page, otherwise the link will go to the site home
global $USER, $CFG, $THEME;
/// Course links
if ($course) {
if ($course == "home") { // special case for site home page - please do not remove
$homelink = "<P ALIGN=center><A TITLE=\"Moodle $CFG->release ($CFG->version)\" HREF=\"http://moodle.com/\">";
$homelink .= "<BR><IMG WIDTH=130 HEIGHT=19 SRC=\"pix/madewithmoodle2.gif\" BORDER=0></A></P>";
$course = get_site();
$homepage = true;
} else {
$homelink = "<A TARGET=_top HREF=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</A>";
}
} else {
$homelink = "<A TARGET=_top HREF=\"$CFG->wwwroot\">".get_string("home")."</A>";
$course = get_site();
}
/// User links
if ($USER->realuser) {
if ($realuser = get_record("user", "id", $USER->realuser)) {
$realuserinfo = " [<A HREF=\"$CFG->wwwroot/course/loginas.php?id=$course->id&return=$realuser->id\">$realuser->firstname $realuser->lastname</A>] ";
}
}
if ($USER->id) {
$username = "<A HREF=\"$CFG->wwwroot/user/view.php?id=$USER->id&course=$course->id\">$USER->firstname $USER->lastname</A>";
$loggedinas = $realuserinfo.get_string("loggedinas", "moodle", "$username").
" (<A HREF=\"$CFG->wwwroot/login/logout.php\">".get_string("logout")."</A>)";
} else {
$loggedinas = get_string("loggedinnot", "moodle").
" (<A HREF=\"$CFG->wwwroot/login/index.php\">".get_string("login")."</A>)";
}
include ("$CFG->dirroot/theme/$CFG->theme/footer.html");
}
function print_navigation ($navigation) {
global $CFG;
if ($navigation) {
if (! $site = get_site()) {
$site->shortname = get_string("home");;
}
echo "<A TARGET=_top HREF=\"$CFG->wwwroot/\">$site->shortname</A> -> $navigation";
}
}
function print_heading($text, $align="CENTER", $size=3) {
echo "<P ALIGN=\"$align\"><FONT SIZE=\"$size\"><B>".stripslashes($text)."</B></FONT></P>";
}
function print_heading_with_help($text, $helppage, $module="moodle") {
// Centered heading with attached help button (same title text)
echo "<P ALIGN=\"CENTER\"><FONT SIZE=\"3\"><B>".stripslashes($text);
helpbutton($helppage, $text, $module);
echo "</B></FONT></P>";
}
function print_continue($link) {
global $HTTP_REFERER;
if (!$link) {
$link = $HTTP_REFERER;
}
print_heading("<A HREF=\"$link\">".get_string("continue")."</A>");
}
function print_simple_box($message, $align="", $width="", $color="#FFFFFF", $padding=5, $class="generalbox") {
print_simple_box_start($align, $width, $color, $padding, $class);
echo stripslashes($message);
print_simple_box_end();
}
function print_simple_box_start($align="", $width="", $color="#FFFFFF", $padding=5, $class="generalbox") {
global $THEME;
if ($align) {
$tablealign = "ALIGN=\"$align\"";
}
if ($width) {
$tablewidth = "WIDTH=\"$width\"";
}
echo "<table $tablealign $tablewidth class=\"$class\" border=\"0\" cellpadding=\"$padding\" cellspacing=\"0\"><tr><td bgcolor=\"$color\" class=\"$class"."content\">";
}
function print_simple_box_end() {
echo "</td></tr></table>";
}
function print_single_button($link, $options, $label="OK") {
echo "<FORM ACTION=\"$link\" METHOD=GET>";
if ($options) {
foreach ($options as $name => $value) {
echo "<INPUT TYPE=hidden NAME=\"$name\" VALUE=\"$value\">";
}
}
echo "<INPUT TYPE=submit VALUE=\"$label\"></FORM>";
}
function print_spacer($height=1, $width=1, $br=true) {
global $CFG;
echo "<IMG HEIGHT=\"$height\" WIDTH=\"$width\" SRC=\"$CFG->wwwroot/pix/spacer.gif\" ALT=\"\">";
if ($br) {
echo "<BR \>\n";
}
}
function print_file_picture($path, $courseid=0, $height="", $width="", $link="") {
// Given the path to a picture file in a course, or a URL,
// this function includes the picture in the page.
global $CFG;
if ($height) {
$height = "HEIGHT=\"$height\"";
}
if ($width) {
$width = "WIDTH=\"$width\"";
}
if ($link) {
echo "<A HREF=\"$link\">";
}
if (substr(strtolower($path), 0, 7) == "http://") {
echo "<IMG BORDER=0 $height $width SRC=\"$path\">";
} else if ($courseid) {
echo "<IMG BORDER=0 $height $width SRC=\"";
if ($CFG->slasharguments) { // Use this method if possible for better caching
echo "$CFG->wwwroot/file.php/$courseid/$path";
} else {
echo "$CFG->wwwroot/file.php?file=$courseid/$path";
}
echo "\">";
} else {
echo "Error: must pass URL or course";
}
if ($link) {
echo "</A>";
}
}
function print_user_picture($userid, $courseid, $picture, $large=false, $returnstring=false, $link=true) {
global $CFG;
if ($link) {
$output = "<A HREF=\"$CFG->wwwroot/user/view.php?id=$userid&course=$courseid\">";
} else {
$output = "";
}
if ($large) {
$file = "f1.jpg";
$size = 100;
} else {
$file = "f2.jpg";
$size = 35;
}
if ($picture) {
if ($CFG->slasharguments) { // Use this method if possible for better caching
$output .= "<IMG SRC=\"$CFG->wwwroot/user/pix.php/$userid/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
} else {
$output .= "<IMG SRC=\"$CFG->wwwroot/user/pix.php?file=/$userid/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
}
} else {
$output .= "<IMG SRC=\"$CFG->wwwroot/user/default/$file\" BORDER=0 WIDTH=$size HEIGHT=$size ALT=\"\">";
}
if ($link) {
$output .= "</A>";
}
if ($returnstring) {
return $output;
} else {
echo $output;
}
}
function print_table($table) {
// Prints a nicely formatted table.
// $table is an object with several properties.
// $table->head is an array of heading names.
// $table->align is an array of column alignments
// $table->size is an array of column sizes
// $table->data[] is an array of arrays containing the data.
// $table->width is an percentage of the page
// $table->cellpadding padding on each cell
// $table->cellspacing spacing between cells
if (isset($table->align)) {
foreach ($table->align as $key => $aa) {
if ($aa) {
$align[$key] = " ALIGN=\"$aa\"";
} else {
$align[$key] = "";
}
}
}
if (isset($table->size)) {
foreach ($table->size as $key => $ss) {
if ($ss) {
$size[$key] = " WIDTH=\"$ss\"";
} else {
$size[$key] = "";
}
}
}
if (!$table->width) {
$table->width = "80%";
}
if (!$table->cellpadding) {
$table->cellpadding = "5";
}
if (!$table->cellspacing) {
$table->cellspacing = "1";
}
print_simple_box_start("CENTER", "$table->width", "#FFFFFF", 0);
echo "<TABLE WIDTH=100% BORDER=0 valign=top align=center ";
echo " cellpadding=\"$table->cellpadding\" cellspacing=\"$table->cellspacing\" class=\"generaltable\">\n";
if ($table->head) {
echo "<TR>";
foreach ($table->head as $key => $heading) {
echo "<TH VALIGN=top ".$align[$key].$size[$key]." NOWRAP class=\"generaltableheader\">$heading</TH>";
}
echo "</TR>\n";
}
foreach ($table->data as $row) {
echo "<TR VALIGN=TOP>";
foreach ($row as $key => $item) {
echo "<TD ".$align[$key].$size[$key]." class=\"generaltablecell\">$item</TD>";
}
echo "</TR>\n";
}
echo "</TABLE>\n";
print_simple_box_end();
return true;
}
function print_editing_switch($courseid) {
global $CFG, $USER;
if (isteacher($courseid)) {
if ($USER->editing) {
echo "<A HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=off\">Turn editing off</A>";
} else {
echo "<A HREF=\"$CFG->wwwroot/course/view.php?id=$courseid&edit=on\">Turn editing on</A>";
}
}
}
function format_float($num, $places=0) {
return sprintf("%.$places"."f", $num);
}
function print_textarea($richedit, $rows, $cols, $width, $height, $name, $value="") {
global $CFG, $THEME;
if ($richedit) {
echo "<object id=richedit style=\"BACKGROUND-COLOR: buttonface\"";
echo " data=\"$CFG->wwwroot/lib/rte/richedit.html\"";
echo " width=\"$width\" height=\"$height\" ";
echo " type=\"text/x-scriptlet\" VIEWASTEXT></object>\n";
echo "<TEXTAREA style=\"display:none\" NAME=\"$name\" ROWS=1 COLS=1>";
p($value);
echo "</TEXTAREA>\n";
} else {
echo "<TEXTAREA name=\"$name\" rows=\"$rows\" cols=\"$cols\" wrap=virtual>";
p($value);
echo "</TEXTAREA>\n";
}
}
function print_richedit_javascript($form, $name, $source="no") {
echo "<SCRIPT language=\"JavaScript\" event=\"onload\" for=\"window\">\n";
echo " document.richedit.options = \"history=no;source=$source\";";
echo " document.richedit.docHtml = $form.$name.innerText;";
echo "</SCRIPT>";
}
function update_course_icon($courseid) {
// Used to be an icon, but it's now a simple form button
global $CFG, $USER;
if (isteacher($courseid)) {
if ($USER->editing) {
$string = get_string("turneditingoff");
$edit = "off";
} else {
$string = get_string("turneditingon");
$edit = "on";
}
return "<FORM TARGET=_parent METHOD=GET ACTION=\"$CFG->wwwroot/course/view.php\">".
"<INPUT TYPE=hidden NAME=id VALUE=\"$courseid\">".
"<INPUT TYPE=hidden NAME=edit VALUE=\"$edit\">".
"<INPUT TYPE=submit VALUE=\"$string\"></FORM>";
}
}
function update_module_button($moduleid, $courseid, $string) {
// Prints the editing button on a module "view" page
global $CFG;
if (isteacher($courseid)) {
$string = get_string("updatethis", "", $string);
return "<FORM TARGET=_parent METHOD=GET ACTION=\"$CFG->wwwroot/course/mod.php\">".
"<INPUT TYPE=hidden NAME=update VALUE=\"$moduleid\">".
"<INPUT TYPE=hidden NAME=return VALUE=\"true\">".
"<INPUT TYPE=submit VALUE=\"$string\"></FORM>";
}
}
function navmenu($course, $cm=NULL) {
// Given a course and a (current) coursemodule
// This function returns a small popup menu with all the
// course activity modules in it, as a navigation menu
// The data is taken from the serialised array stored in
// the course record
global $CFG;
if ($cm) {
$cm = $cm->id;
}
if ($course->format == 'weeks') {
$strsection = get_string("week");
} else {
$strsection = get_string("topic");
}
if (!$modinfo = unserialize($course->modinfo)) {
return "";
}
$section = -1;
$selected = "";
foreach ($modinfo as $mod) {
if ($mod->section > 0 and $section <> $mod->section) {
$menu[] = "-------------- $strsection $mod->section --------------";
}
$section = $mod->section;
$url = "$mod->mod/view.php?id=$mod->cm";
if ($cm == $mod->cm) {
$selected = $url;
}
$mod->name = urldecode($mod->name);
if (strlen($mod->name) > 55) {
$mod->name = substr($mod->name, 0, 50)."...";
}
$menu[$url] = $mod->name;
}
return popup_form("$CFG->wwwroot/mod/", $menu, "navmenu", $selected, get_string("jumpto"), "", "", true);
}
function print_date_selector($day, $month, $year, $currenttime=0) {
// Currenttime is a default timestamp in GMT
// Prints form items with the names $day, $month and $year
if (!$currenttime) {
$currenttime = time();
}
$currentdate = usergetdate($currenttime);
for ($i=1; $i<=31; $i++) {
$days[$i] = "$i";
}
for ($i=1; $i<=12; $i++) {
$months[$i] = date("F", mktime(0,0,0,$i,1,2000));
}
for ($i=2000; $i<=2010; $i++) {
$years[$i] = $i;
}
choose_from_menu($days, $day, $currentdate[mday], "");
choose_from_menu($months, $month, $currentdate[mon], "");
choose_from_menu($years, $year, $currentdate[year], "");
}
function print_time_selector($hour, $minute, $currenttime=0) {
// Currenttime is a default timestamp in GMT
// Prints form items with the names $hour and $minute
if (!$currenttime) {
$currenttime = time();
}
$currentdate = usergetdate($currenttime);
for ($i=0; $i<=23; $i++) {
$hours[$i] = sprintf("%02d",$i);
}
for ($i=0; $i<=59; $i++) {
$minutes[$i] = sprintf("%02d",$i);
}
choose_from_menu($hours, $hour, $currentdate[hours], "");
choose_from_menu($minutes, $minute, $currentdate[minutes], "");
}
function make_timestamp($year, $month=1, $day=1, $hour=0, $minute=0, $second=0) {
// Given date parts in user time, produce a GMT timestamp
return mktime((int)$hour,(int)$minute,(int)$second,(int)$month,(int)$day,(int)$year);
}
function format_time($totalsecs, $str=NULL) {
// Given an amount of time in seconds, prints it
// nicely as months, days, hours etc as needed
$totalsecs = abs($totalsecs);
if (!$str) { // Create the str structure the slow way
$str->day = get_string("day");
$str->days = get_string("days");
$str->hour = get_string("hour");
$str->hours = get_string("hours");
$str->min = get_string("min");
$str->mins = get_string("mins");
$str->sec = get_string("sec");
$str->secs = get_string("secs");
}
$days = floor($totalsecs/86400);
$remainder = $totalsecs - ($days*86400);
$hours = floor($remainder/3600);
$remainder = $remainder - ($hours*3600);
$mins = floor($remainder/60);
$secs = $remainder - ($mins*60);
$ss = ($secs == 1) ? $str->sec : $str->secs;
$sm = ($mins == 1) ? $str->min : $str->mins;
$sh = ($hours == 1) ? $str->hour : $str->hours;
$sd = ($days == 1) ? $str->day : $str->days;
if ($days) $odays = "$days $sd";
if ($hours) $ohours = "$hours $sh";
if ($mins) $omins = "$mins $sm";
if ($secs) $osecs = "$secs $ss";
if ($days) return "$odays $ohours";
if ($hours) return "$ohours $omins";
if ($mins) return "$omins $osecs";
if ($secs) return "$osecs";
return get_string("now");
}
function userdate($date, $format="", $timezone=99) {
// Returns a formatted string that represents a date in user time
// WARNING: note that the format is for strftime(), not date().
// Because of a bug in most Windows time libraries, we can't use
// the nicer %e, so we have to use %d which has leading zeroes.
// A lot of the fuss below is just getting rid of these leading
// zeroes as efficiently as possible.
global $USER;
if ($format == "") {
$format = "%A, %d %B %Y, %I:%M %p";
$formatnoday = "%A, DD %B %Y, %I:%M %p";
$fixday = true;
} else {
$formatnoday = str_replace("%d", "DD", $format);
$fixday = ($formatnoday != $format);
}
if ($timezone == 99) {
if (isset($USER->timezone)) {
$timezone = (float)$USER->timezone;
}
}
if (abs($timezone) > 13) {
if ($fixday) {
$datestring = strftime($formatnoday, $date);
$daystring = str_replace(" 0", "", strftime(" %d", $date));
$datestring = str_replace("DD", $daystring, $datestring);
} else {
$datestring = strftime($format, $date);
}
} else {
if ($fixday) {
$datestring = gmstrftime($formatnoday, $date + (int)($timezone * 3600));
$daystring = str_replace(" 0", "", strftime(" %d", $date));
$datestring = str_replace("DD", $daystring, $datestring);
} else {
$datestring = gmstrftime($format, $date + (int)($timezone * 3600));
}
}
return $datestring;
}
function usergetdate($date, $timezone=99) {
// Given a $date timestamp in GMT, returns an array
// that represents the date in user time
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 13) {
return getdate($date);
}
//There is no gmgetdate so I have to fake it...
$date = $date + (int)($timezone * 3600);
$getdate["seconds"] = gmstrftime("%S", $date);
$getdate["minutes"] = gmstrftime("%M", $date);
$getdate["hours"] = gmstrftime("%H", $date);
$getdate["mday"] = gmstrftime("%d", $date);
$getdate["wday"] = gmstrftime("%u", $date);
$getdate["mon"] = gmstrftime("%m", $date);
$getdate["year"] = gmstrftime("%Y", $date);
$getdate["yday"] = gmstrftime("%j", $date);
$getdate["weekday"] = gmstrftime("%A", $date);
$getdate["month"] = gmstrftime("%B", $date);
return $getdate;
}
function usertime($date, $timezone=99) {
// Given a GMT timestamp (seconds since epoch), offsets it by
// the timezone. eg 3pm in India is 3pm GMT - 7 * 3600 seconds
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 13) {
return $date;
}
return $date - (int)($timezone * 3600);
}
function usergetmidnight($date, $timezone=99) {
// Given a time, return the GMT timestamp of the most recent midnight
// for the current user.
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
$userdate = usergetdate($date, $timezone);
if (abs($timezone) > 13) {
return mktime(0, 0, 0, $userdate["mon"], $userdate["mday"], $userdate["year"]);
}
$timemidnight = gmmktime (0, 0, 0, $userdate["mon"], $userdate["mday"], $userdate["year"]);
return usertime($timemidnight, $timezone); // Time of midnight of this user's day, in GMT
}
function usertimezone($timezone=99) {
// returns a string that prints the user's timezone
global $USER;
if ($timezone == 99) {
$timezone = (float)$USER->timezone;
}
if (abs($timezone) > 13) {
return "server time";
}
if (abs($timezone) < 0.5) {
return "GMT";
}
if ($timezone > 0) {
return "GMT+$timezone";
} else {
return "GMT$timezone";
}
}
function error ($message, $link="") {
global $CFG, $SESSION;
print_header(get_string("error"));
echo "<BR>";
print_simple_box($message, "center", "", "#FFBBBB");
if (!$link) {
if ( !empty($SESSION->fromurl) ) {
$link = "$SESSION->fromurl";
unset($SESSION->fromurl);
save_session("SESSION");
} else {
$link = "$CFG->wwwroot";
}
}
print_continue($link);
print_footer();
die;
}
function helpbutton ($page, $title="", $module="moodle", $image=true, $linktext=false, $text="") {
// $page = the keyword that defines a help page
// $title = the title of links, rollover tips, alt tags etc
// $module = which module is the page defined in
// $image = use a help image for the link? (true/false/"both")
// $text = if defined then this text is used in the page, and
// the $page variable is ignored.
global $CFG;
if ($module == "") {
$module = "moodle";
}
if ($image) {
if ($linktext) {
$linkobject = "$title<IMG align=\"absmiddle\" BORDER=0 HEIGHT=17 WIDTH=22 ALT=\"\" SRC=\"$CFG->wwwroot/pix/help.gif\">";
} else {
$linkobject = "<IMG align=\"absmiddle\" BORDER=0 HEIGHT=17 WIDTH=22 ALT=\"$title\" SRC=\"$CFG->wwwroot/pix/help.gif\">";
}
} else {
$linkobject = $title;
}
if ($text) {
$url = "/help.php?module=$module&text=".htmlentities(urlencode($text));
} else {
$url = "/help.php?module=$module&file=$page.html";
}
link_to_popup_window ($url, "popup", $linkobject, 400, 500, $title);
}
function notice ($message, $link="") {
global $THEME, $HTTP_REFERER;
if (!$link) {
$link = $HTTP_REFERER;
}
echo "<BR>";
print_simple_box($message, "center", "", "$THEME->cellheading");
print_heading("<A HREF=\"$link\">".get_string("continue")."</A>");
print_footer(get_site());
die;
}
function notice_yesno ($message, $linkyes, $linkno) {
global $THEME;
print_simple_box_start("center", "", "$THEME->cellheading");
echo "<P ALIGN=CENTER><FONT SIZE=3>$message</FONT></P>";
echo "<P ALIGN=CENTER><FONT SIZE=3><B>";
echo "<A HREF=\"$linkyes\">".get_string("yes")."</A>";
echo " ";
echo "<A HREF=\"$linkno\">".get_string("no")."</A>";
echo "</B></FONT></P>";
print_simple_box_end();
}
function redirect($url, $message="", $delay=0) {
// Uses META tags to redirect the user, after printing a notice
echo "<META HTTP-EQUIV='Refresh' CONTENT='$delay; URL=$url'>";
if (!empty($message)) {
print_header();
echo "<CENTER>";
echo "<P>$message</P>";
echo "<P>( <A HREF=\"$url\">".get_string("continue")."</A> )</P>";
echo "</CENTER>";
}
die;
}
function notify ($message) {
echo "<P align=center><B><FONT COLOR=#FF0000>$message</FONT></B></P>\n";
}
/// PARAMETER HANDLING ////////////////////////////////////////////////////
function require_variable($var) {
if (! isset($var)) {
error("A required parameter was missing");
}
}
function optional_variable(&$var, $default=0) {
if (! isset($var)) {
$var = $default;
}
}
/// DATABASE HANDLING ////////////////////////////////////////////////
function execute_sql($command, $feedback=true) {
// Completely general
global $db;
$result = $db->Execute("$command");
if ($result) {
if ($feedback) {
echo "<P><FONT COLOR=green><B>".get_string("success")."</B></FONT></P>";
}
return true;
} else {
if ($feedback) {
echo "<P><FONT COLOR=red><B>".get_string("error")."</B></FONT></P>";
}
return false;
}
}
function modify_database($sqlfile) {
// Assumes that the input text file consists of a number
// of SQL statements ENDING WITH SEMICOLONS. The semicolons
// MUST be the last character in a line.
// Lines that are blank or that start with "#" are ignored.
// Only tested with mysql dump files (mysqldump -p -d moodle)
if (file_exists($sqlfile)) {
$success = true;
$lines = file($sqlfile);
$command = "";
while ( list($i, $line) = each($lines) ) {
$line = chop($line);
$length = strlen($line);
if ($length && substr($line, 0, 1) <> "#") {
if (substr($line, $length-1, 1) == ";") {
$line = substr($line, 0, $length-1); // strip ;
$command .= $line;
if (! execute_sql($command)) {
$success = false;
}
$command = "";
} else {
$command .= $line;
}
}
}
} else {
$success = false;
echo "<P>Tried to modify database, but \"$sqlfile\" doesn't exist!</P>";
}
return $success;
}
function record_exists($table, $field, $value) {
global $db;
$rs = $db->Execute("SELECT * FROM $table WHERE $field = '$value' LIMIT 1");
if (!$rs) return false;
if ( $rs->RecordCount() ) {
return true;
} else {
return false;
}
}
function record_exists_sql($sql) {
global $db;
$rs = $db->Execute($sql);
if (!$rs) return false;
if ( $rs->RecordCount() ) {
return true;
} else {
return false;
}
}
function count_records($table, $selector, $value) {
// Get all the records and count them
global $db;
$rs = $db->Execute("SELECT COUNT(*) FROM $table WHERE $selector = '$value'");
if (!$rs) return 0;
return $rs->fields[0];
}
function count_records_sql($sql) {
// Get all the records and count them
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return 0;
return $rs->fields[0];
}
function get_record($table, $selector, $value) {
// Get a single record as an object
global $db;
$rs = $db->Execute("SELECT * FROM $table WHERE $selector = '$value'");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return (object)$rs->fields;
} else {
return false;
}
}
function get_record_sql($sql) {
// Get a single record as an object
// The sql statement is provided as a string.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return (object)$rs->fields;
} else {
return false;
}
}
function get_records($table, $selector, $value, $sort="", $fields="*") {
// Get a number of records as an array of objects
// Can optionally be sorted eg "time ASC" or "time DESC"
// If "fields" is specified, only those fields are returned
// The "key" is the first column returned, eg usually "id"
global $db;
if ($sort) {
$sortorder = "ORDER BY $sort";
}
$sql = "SELECT $fields FROM $table WHERE $selector = '$value' $sortorder";
return get_records_sql($sql);
}
function get_records_list($table, $selector, $values, $sort="", $fields="*") {
// Get a number of records as an array of objects
// Differs from get_records() in that the values variable
// can be a comma-separated list of values eg "4,5,6,10"
// Can optionally be sorted eg "time ASC" or "time DESC"
// The "key" is the first column returned, eg usually "id"
global $db;
if ($sort) {
$sortorder = "ORDER BY $sort";
}
$sql = "SELECT $fields FROM $table WHERE $selector in ($values) $sortorder";
return get_records_sql($sql);
}
function get_records_sql($sql) {
// Get a number of records as an array of objects
// The "key" is the first column returned, eg usually "id"
// The sql statement is provided as a string.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() > 0 ) {
if ($records = $rs->GetAssoc(true)) {
foreach ($records as $key => $record) {
$objects[$key] = (object) $record;
}
return $objects;
} else {
return false;
}
} else {
return false;
}
}
function get_records_sql_menu($sql) {
// Given an SQL select, this function returns an associative
// array of the first two columns. This is most useful in
// combination with the choose_from_menu function to create
// a form menu.
global $db;
$rs = $db->Execute("$sql");
if (!$rs) return false;
if ( $rs->RecordCount() > 0 ) {
while (!$rs->EOF) {
$menu[$rs->fields[0]] = $rs->fields[1];
$rs->MoveNext();
}
return $menu;
} else {
return false;
}
}
function get_field($table, $field, $selector, $value) {
global $db;
$rs = $db->Execute("SELECT $field FROM $table WHERE $selector = '$value'");
if (!$rs) return false;
if ( $rs->RecordCount() == 1 ) {
return $rs->fields["$field"];
} else {
return false;