The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Please let me know how to use isset() correctly.
Thanks ahead.
<?php
if(!isset($_POS T['varA'])||!isset($_POS T['varB'])){
?>
<form action="isset.p hp" method="POST">
<table><tr>
<td>Value 1:</td><td><input type="text" name="varA" value=""></td></
tr>
<tr><td>Value 2:</td><td><input type="text" name="varB" value=""></
td></tr>
<tr><td colspan="2"><in put type="submit" value="submit"> </td></tr>
</table>
</form>
<?php
}
else {
$x=$_POST['varA'];
$y=$_POST['varB'];
if($x>$y){
echo "Value 1:".$x." is larger";
}else
echo "Value 2:".$y." is larger";
}
?> 10  2359 
major a écrit :
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Exactly, "blank" is still a value. isset just verify that the variable
*is set*, whatever its content.
Regards,
--
Guillaume
On 28 fév, 08:51, major <extreme...@gma il.comwrote:
The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Please let me know how to use isset() correctly.
Thanks ahead.
<?php
if(!isset($_POS T['varA'])||!isset($_POS T['varB'])){
?>
<form action="isset.p hp" method="POST">
<table><tr>
<td>Value 1:</td><td><input type="text" name="varA" value=""></td></
tr>
<tr><td>Value 2:</td><td><input type="text" name="varB" value=""></
td></tr>
<tr><td colspan="2"><in put type="submit" value="submit"> </td></tr>
</table>
</form>
<?php
}
else {
$x=$_POST['varA'];
$y=$_POST['varB'];
if($x>$y){
echo "Value 1:".$x." is larger";
}else
echo "Value 2:".$y." is larger";
}
?>
use empty() :
if ( ( isset($_POST['varA'] && !empty($_POST['varA']) ) || ...
ichevc
"major" <ex********@gma il.comwrote in message
news:b2******** *************** ***********@p43 g2000hsc.google groups.com...
The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Please let me know how to use isset() correctly.
This one, I actually can help with :)
This page will save you a lot of grief if you take a few minutes to read and
understand it: http://us3.php.net/manual/en/types.comparisons.php
major wrote:
The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would want
to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
Tony wrote:
major wrote:
>The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would want
to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
Yes, validate it with a regex also:
$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
if (!$name)
{
....
}
would check to see if the post variable has been set and if it matches a
string of alpha a-z (upper & lower case), and is at least 2 characters
but not more than 25 characters in length. If not it's set to false and
you take appropriate action.
--
Norman
Registered Linux user #461062
Norman Peelman wrote:
Tony wrote:
>major wrote:
>>The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would
want to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
Yes, validate it with a regex also:
$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
if (!$name)
{
....
}
would check to see if the post variable has been set and if it matches a
string of alpha a-z (upper & lower case), and is at least 2 characters
but not more than 25 characters in length. If not it's set to false and
you take appropriate action.
But what if I don't want to validate according to those rules?
Tony wrote:
Norman Peelman wrote:
>Tony wrote:
>>major wrote:
The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would
want to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
Yes, validate it with a regex also:
$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
if (!$name)
{
....
}
would check to see if the post variable has been set and if it matches
a string of alpha a-z (upper & lower case), and is at least 2
characters but not more than 25 characters in length. If not it's set
to false and you take appropriate action.
But what if I don't want to validate according to those rules?
Then make up your own rules. And accept that if you don't do it right,
someone can delete your entire database - or at least an entire table.
--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp. js*******@attgl obal.net
=============== ===
Tony wrote:
Norman Peelman wrote:
>Tony wrote:
>>major wrote:
The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would
want to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
Yes, validate it with a regex also:
$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
if (!$name)
{
....
}
would check to see if the post variable has been set and if it matches
a string of alpha a-z (upper & lower case), and is at least 2
characters but not more than 25 characters in length. If not it's set
to false and you take appropriate action.
But what if I don't want to validate according to those rules?
What rules do you want to validate by?
--
Norman
Registered Linux user #461062
"Tony" <no****@example .comwrote in message
news:13******** *****@corp.supe rnews.com...
major wrote:
>The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.
Apparently isset() is not working, because it thinks that a blank text
field is set to something.
Yes, if the value of a field is "", then it is still set. You would want
to test for both:
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
Or, if you want to count " " as blank:
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
There may be a more efficient way to do this - anyone know of one?
if($_POST['name']) {
This will, however, evaluate 0 and "0" to false. It will also throw a
warning. !empty() is exactly the same thing, but does not throw a warning. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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