A weird problem / bug with concatenation operator in a class
| From: | Administrator | Date: | Fri, 01 Feb 2002 22:27:46 +0000 |
| Subject: | A weird problem / bug with concatenation operator in a class | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-83205@lists.php.net to get a copy of this message | ||
Yesterday I presented this problem to a local usergroup...
// the following lines are contained in a class
// although I am echoing the value of $age from within the class
// this is only for testing during development.
// $age will be assigned to [$this->age_Range] later in the code
$age = " AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5)<RIGHT(dob,5))";
$age .= " BETWEEN '$this->minAge' AND '$this->maxAge')";
echo $age."<br>";
Output of the echo statement looks exactly like this...
AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5)<RIGHT(dob,5))
-----------------------------------------------------------------------------------------------
Here is what I found:
Now, from the above if I add white space between "...)<R..." like this "...) <
R..." everything works!
The revised assignment looks like this:
$age = " AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5) < RIGHT(dob,5))";
$age .= " BETWEEN '28' AND '42')";
And echoes:
AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5)<RIGHT(dob,5))BETWEEN '28'
AND '42')
-----------------------------------------------------------------------------------------------
If you run the following code, you will see what I mean. I found this to be the case with PHP 4.0.2
on Windows NT 4.0 and with PHP 4.0.6 on Linux. At one point I found that echo of $age from outside
the class returned the proper value regardless of white space, now I can not re-create this. The
behavior would appear to be the same regardless of where you echo the var from.
For what it's worth...
Kevin
---------------------------------------------------------
<?PHP
/*+------------------------------------------+
|File: testclass.cls.php |
|By: Kevin Koons |
|On: Friday, February 01, 2002 11:34:41 AM |
+------------------------------------------+*/
$myProfile = new profile;
$sql = $myProfile->profile1();
echo "<B>The value of [\$age] returned by</B>
\$myProfile->profile1()<br><hr><br>".$sql."<br><hr><br><br><br>";
echo "<B>called from class profile using</B> echo
\$myProfile->age_Range<br><hr><br>".$myProfile->age_Range."<br><hr><br><br><br>";
$sql = $myProfile->profile2();
echo "<B>The value [\$age] returned by</B>
\$myProfile->profile2()<br><hr><br>".$sql."<br><hr><br><br><br>";
echo "<B>called from class profile using</B> echo
\$myProfile->age_Range<br><hr><br>".$myProfile->age_Range."<br><hr><br><br><br>";
class profile
{
var $age_Range;
var $minAge = 28;
var $maxAge = 42;
Function profile1() {
// orig code, no white space
$age = " AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5)<RIGHT(dob,5))";
$age .= " BETWEEN '$this->minAge' AND '$this->maxAge')";
$this->age_Range = $age;
echo "<B>Echoed from IN class Profile, no white
space</B><br><hr><br>";
echo $this->age_Range."<br><hr><br><br><br>";
Return ($age);
}
Function profile2() {
// added white space between "...) < RIGHT..."
$this->age_Range = " AND ((YEAR(CURRENT_DATE)-YEAR(dob)) - (RIGHT(CURRENT_DATE,5) <
RIGHT(dob,5))";
$this->age_Range .= " BETWEEN '$this->minAge' AND
'$this->maxAge')";
echo "<B>Echoed from IN class Profile, white space
added</B><br><hr><br>";
echo $this->age_Range."<br><hr><br><br><br>";
Return ($age);
}
}
?>