[PHP] Explain that function!

[Protege]

Or that.

[QuickScriptz]

Well, let's all just put down the one guy who's trying to make the Forum a little more interesting.... who cares if you reference the PHP website as a reference? A lot of the time the site can confuse instead of help so I think this thread is a great idea. Anyways...

Today I'm going to talk about the rand() function.

<?php
// rand ( lowestDigit, highestDigit )
echo rand(1,5); // Outputs any of these: 1 2 3 4 5
?>

What this function does is generate a random integer between lowestDigit and highestDigit (note that it includes the lowestDigit and highestDigit in it's number range - basically it can return lowestDigit, highestDigit, and everything in between).

I find this function very helpful when you're trying to generate random CAPTCHAs, License Keys/Key Codes, and anything else that requires random anything.

Hope this helps someone out

[Jackboy]

if($x == 0) {
// error
} elseif($x > 0) {
//succeed
} else {
// error
}

apposed to

if($x == 0) {
// fail
} else {
if($x > 0) {
// succeed
} else {
// fail
}
}

What ar you on about?

I did this:

<?PHP
$knownSinner = mysql_query("SELECT * FROM `idiotlist` WHERE `username` = 'knownSinner'");
$Howmany = mysql_num_rows($knownSinner);
if ($Howmany == '0'){
print "You are only lying to yourself...";
}else{
print "Thats what i thought.";
}
?>

[Protege]

So what happens if mysql_num_rows returns an error

[Jackboy]

So what happens if mysql_num_rows returns an error

Why would it?

$knownSinner is a valid resource.

[Protege]

I meant if it did, "what happens if" it was to error?

[Decode]

Or you could just do
if( $x >= 1 )
{
//success
}
else
{
//fail
}

or

if( $x >= 1 )
{
echo ("You failed");
}
else
{
echo ("You failed again");
}

[Blinger1]

you fail.

[Baving]

I meant if it did, "what happens if" it was to error?

It would return the same error message doing it either as:

 if(mysql_num_rows($result)==0) { } 

or

 $result = mysql_num_rows($query);
if($result==0) { } 

mysql_num_rows only converts the query result from mysql_query, it doesn't contact the database again.

Personally I prefer to use:

 if(mysql_num_rows($result)==0) { } 

It is just the same as putting it into a class and executing it:

 if($db->num_rows($query)==0) { } 

However the proper way in which to return the amount of rows is by doing it in the SQL itself:

select count(id) as total from tablename where 1=1

[Protege]

Yea baving im not talkin about that, im talking about his method of doing it.