Menus & Navigation
|
|
|
|
<?php
// -----------------------------------------------------------------------------
// function : wzProcess
// parameter: $str = string that represents an expression
// ?expression
// expression = token operator expression
// token = 0|1|variable
// operator = (),=,>,<,&,|
//
// example:
// ?(ge_system=Fire280)&(ge_os=2.8)
// evaluates true if the Variable ge_system is Fire280
// and ge_os is 2.8.
//
// return : true or false
// purpose : Evaluate a given expression to true ore false
// -----------------------------------------------------------------------------
function wzProcess($string) {
static $str;
$operators = "?()|&=<>~";
$token = "";
$result = "";
$operator = "";
// set the loopcount to 0 and store the shortend string to the $str
// value. Cause $str is static, we will deal with the shortend string
// on return.
$i = 0;
$str = $string;
// loop until we find an operator
for (; $i<strlen($str);$i++) {
if (strchr($operators,$str[$i])) {
$operator = $str[$i];
break;
} else {
$token .= $str[$i];
}
}
// this will replace the token if we have a ge_ session variable
$token = wzIsVariable($token);
// process the operator that was found.
switch ($operator) {
case '?' :
$token = wzProcess(substr($str,$i+1));
break;
case '(' :
$result = wzProcess(substr($str,$i+1));
$str = $result.$str;
$token = wzProcess($str);
break;
case ')' :
$str = substr($str,$i+1);
return $token;
break;
case '|' :
$result = wzProcess(substr($str,$i+1));
$token = wzOR($result,$token);
break;
case '&' :
$result = wzProcess(substr($str,$i+1));
$token = wzAND($result,$token);
break;
case '=' :
$result = wzProcess(substr($str,$i+1));
$token = wzEQUAL($result,$token);
break;
case '~' :
$result = wzProcess(substr($str,$i+1));
$token = wzISIN($result,$token);
break;
case '<' :
$result = wzProcess(substr($str,$i+1));
$token = wzLESS($token, $result);
break;
case '>' :
$result = wzProcess(substr($str,$i+1));
$token = wzBIGGER($token, $result);
break;
}
// return the token for further processing
return $token;
}
// -----------------------------------------------------------------------------
// function : wzOR
// parameter: $var1 -> The first value
// $var2 -> Second value
// return : true or false
// purpose : This function can used to execute an OR between to values
// result is true if one of the variables is true.
// -----------------------------------------------------------------------------
function wzOR($val1,$val2) {
return (bool)($val1 | $val2);
}
// -----------------------------------------------------------------------------
// function : wzAND
// parameter: $var1 -> The first value
// $var2 -> Second value
// return : true or false
// purpose : This function can used to execute an AND between to values
// result is true if both variables are true.
// -----------------------------------------------------------------------------
function wzAND($val1,$val2) {
return (bool)($val1 & $val2);
}
// -----------------------------------------------------------------------------
// function : wzISIN
// parameter: $value -> the value that is searched within the
// $pattern -> pattern
// return : true or false
// purpose : This function can used to match a pattern between to values
// If the pattern is found it will return true.
// NOTICE: if you match against seperated strings like "1 2 3"
// an <space> should be added to the $value string.
// -----------------------------------------------------------------------------
function wzISIN($value,$pattern) {
if (preg_match("/".$value."/",$pattern." ")) return 1;
return 0;
}
// -----------------------------------------------------------------------------
// function : wzBIGGER
// parameter: $var1 -> The first value
// $var2 -> Second value
// return : true or false
// purpose : var1 is bigger then var 2 (integer compare)
// -----------------------------------------------------------------------------
function wzBIGGER($val1,$val2) {
if ($val1 > $val2) {
return 1;
}
return 0;
}
// -----------------------------------------------------------------------------
// function : wzLESS
// parameter: $var1 -> The first value
// $var2 -> Second value
// return : true or false
// purpose : var1 is less then var2 (integer compare)
// -----------------------------------------------------------------------------
function wzLESS($val1,$val2) {
if ($val1 < $val2) {
return 1;
}
return 0;
}
// -----------------------------------------------------------------------------
// function : wzEQUAL
// parameter: $var1 -> The first value
// $var2 -> Second value
// return : true or false
// purpose : var1 is equal to var2 (integer compare/ may also work on strings)
// -----------------------------------------------------------------------------
function wzEQUAL($val1,$val2){
if ($val1 == $val2) return 1;
return 0;
}
// -----------------------------------------------------------------------------
// function : wzIsVariable
// parameter: $var -> The value to check
//
// return : alway a value
// purpose : if the given string is a $_SESSION variable, this function will
// return the content of this variable. This function can be enhanced
// for other cases.
// -----------------------------------------------------------------------------
function wzIsVariable($var) {
if (preg_match("/ge_/",$var)) {
if (isset($_SESSION[$var])) {
return $_SESSION[$var];
} else {
return 0;
}
}
return $var;
}
?>
|
|
|
Usage Example
|
|
|
Rate This Script
|
|
|
|
Store
Your email: