recognizing and reading a new line character

[phpnewbie26]

In my program I have an if else statement where I'm trying to see if that line is a skipped line. My text is like this:

fruits

vegetables.

So it has to be able to know to skip to the next line if theres no text in that line.

if ($invalidcheck[0]=='\r\n'){
		$i++;
		}

but it doesn't seem to be reading it. Does anyone know how I can fix this? Also I was wondering if it is reasonable to try to do something like if the character isn't a-z, A-Z, and all symbols.
Thanks

[Atli]

Try using the trim and empty functions to check the value.
[code=php]<?php
$value = "\r\n ";

$value = trim($value);
if(empty($value )){
echo "Empty";
}
else {
echo "Not empty";
}
?>[/code]

Also I was wondering if it is reasonable to try to do something like if the character isn't a-z, A-Z, and all symbols.
Thanks

Whether it is reasonable to do, that's up to you, and whoever else is designing your application.

If it is, you can easily do that using regular expressions.
Like:
[code=php]if(preg_match('/^[a-zA-Z]+$/i', $value))[/code]
This would only allow the $value to contain letters.
(And only letters... no numbers, spaces, question marks, etc...)

[phpnewbie26]

The trim and empty function worked perfectly. Thanks! I'm new to php so I wasn't even aware of that function.=)

[Markus]

Try using the trim and empty functions to check the value.
[code=php]<?php
$value = "\r\n ";

$value = trim($value);
if(empty($value )){
echo "Empty";
}
else {
echo "Not empty";
}
?>[/code]


Whether it is reasonable to do, that's up to you, and whoever else is designing your application.

If it is, you can easily do that using regular expressions.
Like:
[code=php]if(preg_match('/^[a-zA-Z]+$/i', $value))[/code]
This would only allow the $value to contain letters.
(And only letters... no numbers, spaces, question marks, etc...)

Shouldn't that be [^a-zA-Z0-9]? Or do they both work the same?

[Markus]

The trim and empty function worked perfectly. Thanks! I'm new to php so I wasn't even aware of that function.=)

You should try and use other options, instead of the preg_* functions as they're said to be pretty slow (the preg_* functions), although it's probably such a small difference it's pointless bringing it up (will have to benchmark it).

[Atli]

Shouldn't that be [^a-zA-Z0-9]? Or do they both work the same?

Just different varieties.

Mine was like:
[code=php]
if(<only allowed chars found>) {
// Do stuff
}
else {
// Don't do stuff
}[/code]
But yours is more like:
[code=php]
if(<illegal chars found>) {
// Don't do stuff
}
else {
// Do stuff
}[/code]
Whitelist vs. Blacklist approaches... although in this case, with the ^ in the regex class, they are not so different.

[Atli]

The trim and empty function worked perfectly. Thanks! I'm new to php so I wasn't even aware of that function.=)

Glad it worked :)