[PHP] how to check REMOTE_ADDR to see if it contains PART of an ip
hello. i am trying to write a simple php line that
checks the REMOTE_ADDR variable and see if it comes
from a specific netblock (to see if A.B.C is contained
in a REMOTE_ADDR of A.B.C.D) But how do i do this?
i know there is a php function that checks the string
for the presence of another one... any help please?
the php site is only helpful to me if i know which
function i wish to look up by name.
in a nutshell:
if (150.200.250.x is within
$REMOTE_ADDR){dowhatever}
thanks!
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Re: [PHP] how to check REMOTE_ADDR to see if it contains PART of an ip
nah, there's another one that you don't have to
speficy the length. i remember seeing it used once
when checking the user's browser to see if the string
mozilla was contained within the variable...
besides, i changed the string to check for by one
digit and it still returned true because PART of the
string was true i guess... i dunno.
anyone else got another function in mind?
--- [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
strncmp()
MANUAL!
bvr.
On Wed, 16 Jan 2002 10:41:51 -0800 (PST), Police
Trainee wrote:
hello. i am trying to write a simple php line that
checks the REMOTE_ADDR variable and see if it comes
from a specific netblock (to see if A.B.C is
contained
in a REMOTE_ADDR of A.B.C.D) But how do i do this?
i know there is a php function that checks the
string
for the presence of another one... any help please?
the php site is only helpful to me if i know which
function i wish to look up by name.
in a nutshell:
if (150.200.250.x is within
$REMOTE_ADDR){dowhatever}
thanks!
__
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Re: [PHP] how to check REMOTE_ADDR to see if it contains PART of an ip
At 10:58 AM 1/16/2002 -0800, Police Trainee wrote:
in a nutshell:
if (150.200.250.x is within
$REMOTE_ADDR){dowhatever}
There are a couple of different ways to accomplish this. One is:
if (strpos($REMOTE_ADDR,150.200.250.) !== false) {
//do whatever
}
You have to be careful with strpos()...note the !== operator which is
required because strpos() can return an integer 0 meaning I found your
string at position 0, or it can return a boolean FALSE indicating I
didn't find your string at all. If you don't use the extra = then you
won't know the difference between those two cases, since an integer 0 is
implicitly converted to boolean FALSE if you aren't also checking for
variable type. This will especially cause a problem in your case, because
the string you are searching for will ALWAYS be found at position 0 if it's
found at all. BTW, I include the trailing period so that you don't
accidentally match an ip such as 208.150.200.250
The second way is to use a regular expression:
if (ereg(^150\.200\.250,$REMOTE_ADDR)) {
//do whatever
}
The trailing period isn't necessary here because I'm using the ^ symbol
which anchors the match to the beginning of the string.
To me the second example is more intuitive but is probably less efficient
in terms of execution time...
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Re: [PHP] how to check REMOTE_ADDR to see if it contains PART of an ip
yeah, like strpos() you still could have gotten from the manual.
strncmp() does it exactly, like strpos() but only searches the beginning,
note that it returns false for matching strings for use in some sorting functions.
?php
$testip = 150.200.250.x;
$match = 150.200.250.;
if (!strncmp($testip, $match, strlen($match)))
{
echo(ok, . $testip . matches);
}
?
bvr.
On Wed, 16 Jan 2002 10:58:16 -0800 (PST), Police Trainee wrote:
nah, there's another one that you don't have to
speficy the length. i remember seeing it used once
when checking the user's browser to see if the string
mozilla was contained within the variable...
besides, i changed the string to check for by one
digit and it still returned true because PART of the
string was true i guess... i dunno.
anyone else got another function in mind?
--- [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
strncmp()
MANUAL!
bvr.
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