How to make sure text is not all caps.

Volitics

Hello;

I'm trying to figure out how to check a user's input to make sure that they have not entered the text using all caps.

What I'm doing is writing a classified ads program where people can input their own advertisements. I think that some people might want to get greedy and use 100% capitalization.

What I want to do is make sure that they use appropriate upper/lower case lettering.

Can anybody make any suggestions about how I can do that?

Thanks.

Weedpacket

There are a number of string functions that alter the case of letters. Making letters upper-case, making letters lower-case, even a couple of mixed-case functions.

elcius

don't flame my lame php skills, i only know a few functions

$string = "aBCDeFGHiJ";
$unwanted = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$bad=0;
for($i=0;$i<=(strlen($string)-1);$i++){
if(strpos($unwanted,substr($string,$i,1))!==false)$bad++;
}
$percent = round($bad/strlen($string)*100);
echo $percent."% of the chars in \$string wheres caps :)";

ssanders82

To simply check if all letters aren't caps, try:

if ($text != strtoupper($text)
{
   // Valid
}
else
{
   // Invalid because all letters are caps
}

To specify a certain maximum percentage of capital letters is a little trickier. Off the top of my head it would be something like:

$maxPercentageCaps = 0.80;
$length = strlen($text);
$countCaps = 0;
for ($i = 0; $i < $length; $i++)
{
   // For each letter, check if it is capital and increment # of capital letters
   // if it is.
   if ($text[$i] == strtoupper($text[$i]) $countCaps++;
}
$capsPercentage = $countCaps / $length;
if ($capsPercentage <= $maxPercentageCaps)
{
   // Valid entry
}

You could also add code to deal with numbers in the text, etc., but that should get you started.

Volitics

Weedpacket, elcius, ssanders82;

Thanks for helping out with my problem. That's enough to get me going on the right foot. Thanks again.