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lib.php
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lib.php
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<?php
// Purpose: A project-independent store of useful PHP functions and directives.
// report any errors at all
error_reporting(E_ALL);
// ignore 'STOP' button, any code after this will always run to completion
set_time_limit(0);
ignore_user_abort(true);
// force the arg separator to be "&", not just "&", which is incorrect under the HTML spec.
ini_set ("arg_separator.output", "&");
/*
** @desc: sends headers to disable caching in many proxies and clients.
*/
function force_no_cache() {
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past
header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
header ("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0"); // HTTP/1.1
header ("Pragma: no-cache"); // HTTP/1.0
}
// ------------------ DB operations --------------------------
// all database interactions are only via a set of functions defined in the appropriate RDBMS .php file.
// This makes any potential database migrations significantly easier, such as to Postgresql
// This file should be included in the app's .php file, not here, and DB access should be done using
// functions defined in that file, never directly or hard-coded to use just one RDBMS
// - DB layer, but RDBMS-independent:
/*
** @desc: make a string safe for insertion in a database and subsequent display back in the browser
*/
function DB_safe_string($str, $addSlashes = true, $addTicks = false) {
$retval = $addSlashes ? addslashes(htmlentities($str)) : htmlentities($str);
if ($addTicks) return ("'" . $retval . "'");
else return $retval;
}
// ----------------------------------------------------------
/*
** @desc: takes a string with html entities (e.g. " " instead of " "), and converts it back into straight text
** Superceded by the "html_entity_decode" function, present in PHP >= 4.3.0
*/
function unhtmlentities($str) {
$trans = get_html_translation_table (HTML_ENTITIES);
$trans = array_flip ($trans);
$trans["<br>"] = "\n"; // required, as for some reason this is not part ofthe html_translation_table
$ret = strtr ($str, $trans);
return preg_replace('/&#(\d+);/me', "chr('\\1')",$ret);
}
/*
** @desc: starts a form
*/
function form_begin ($target="", $form_name = "mainForm") {
global $PHP_SELF;
if (!$target) $target = $PHP_SELF;
// DEBUGGING URL:
// this is the best form encoding to use - works for files and allow lots of arguments, beyond the limits of
// some other ENCTYPE/METHODs
return "<form enctype=\"multipart/form-data\" action=\"$target\" method=\"post\" name=\"$form_name\" id=\"$form_name\">";
}
/*
** @desc: returns the HTML code for a button
*/
function add_button ($buttonLabel, $varName) {
return ("<input type=\"submit\" name=\"$varName\" value=\"".htmlSpecialChars($buttonLabel)."\">");
}
/*
** @desc: returns the HTML code for a text area
*/
function textarea ($name, $contents, $cols=70, $rows=8) {
return "<textarea name=\"$name\" cols=\"$cols\" rows=\"$rows\">\n$contents</textarea>";
}
/*
** @desc: a class that encapsulates HTML tables, and common operations on them
*/
class table {
var $inHeader;
var $nextCellProperty= "";
var $tableProperty = "";
var $allCellProperty = "";
var $nextRowProperty = "";
function beginNewRow() { // this is a private function, not to be called externally
print "\n<tr" . ($this->nextRowProperty?" $this->nextRowProperty":"") . ">";
$this->nextRowProperty = "";
}
function begin ($str = "no header row") {
switch ($str) {
case "no header row" : $this->inHeader = false;
break;
case "has header row": $this->inHeader = true;
break;
default : trigger_error("Unknown header case: $str\n");
$this->inHeader = false;
}
print "\n<table $this->tableProperty>";
$this->beginNewRow();
}
function newRow() {
print "\n</tr>";
$this->inHeader = false;
$this->beginNewRow();
}
function end($include_blank_line = true) {
print "\n</tr>";
print "\n</table>\n";
if ($include_blank_line) print "<br>\n";
}
function setInHeader($val) {
$this->inHeader = $val;
}
function addCell($str = "", $hasError = false) {
if ($this->inHeader) {
$start_tag = "th"; // table header cell
$end_tag = "th";
}
else {
$start_tag = "td class=\"visTD\""; // table element cell
$end_tag = "td";
}
if ($str == "" && $this->nextCellProperty == "" && $this->allCellProperty == "") {
print "\n<$start_tag>" . blankSpace() . "</$end_tag>";
return;
}
print ("\n<$start_tag");
if ($this->nextCellProperty != "") print " $this->nextCellProperty";
if ($this->allCellProperty != "") print " $this->allCellProperty";
print (">");
if ($hasError) print "<div class=\"error\">"; // the "error" style
if ($str == "") print blankSpace();
else print ($str);
if ($hasError) print "</div>"; // the "error" style
print "</$end_tag>";
$this->nextCellProperty = "";
}
/*
** @desc: prints a cell without all the formatting gumph
*/
function addNonFormattedCell($contents = "", $property = "") {
$tag = $this->inHeader ? "th" : "td";
if ($contents == "") $contents = blankSpace();
print "\n<$tag" . ($property ? " $property" : "") . ">$contents</$tag>";
}
function addCellProperty($str) {
if ($this->nextCellProperty != "") $this->nextCellProperty .= " ";
$this->nextCellProperty .= $str;
}
// CTOR
function table($tableProperty = "border=\"2\"") {
if ($this->tableProperty != "") $this->tableProperty .= " ";
$this->tableProperty .= $tableProperty;
}
function setAllCellProperty($str) {
$this->allCellProperty = $str;
}
function setNextRowProperty($str) {
$this->nextRowProperty = $str;
}
}
?>