| | I created this topic mainly because I wanna get a clear interpretation about those listed PHP functions. The first function is while($row=mysql_fetch_array($query)) { |
| Jul 4, 2009 |
QUOTE(alex1985 @ Jun 11 2008, 05:46 PM)  I created this topic mainly because I wanna get a clear interpretation about those listed PHP functions. The first function is while($row=mysql_fetch_array($query)) { You have called a sql and loaded it into variable $query. And by that line, you have loaded all coulombs into the variable $row as an array from the variable $query. After this, it is easy to call a coulomb by the variable $row. For example: if there is a coulomb "username" in the table, you can call it by $row['username'] . This is the easiest way to call a coulomb. And each while repeats the next row will be loaded into the variable $row until all rows finishes. QUOTE(alex1985 @ Jun 12 2008, 11:10 AM) Explain me the following line; $user=trim($_POST['user']) trim function is a combine of left trim and right trim. trim deletes the spaces in the left and in the right of the variable. Here variable $user has been set to $_POST['user'] without spaces around it. For example: $_POST['user'] is CODE ' user\'s name ' trim function will give you the result CODE 'user\'s name' and set it to $user.
I did not get it clearly! For which puposse the function is used?!
QUOTE(alex1985 @ Jun 12 2008, 09:32 PM) I did not get it clearly! For which puposse the function is used?! The trim function erases the spaces,tabs, at the start and at the end. For example: in your code: CODE 1. if ($_GET['login']) { #checks for admin login 2. $user=trim($_POST['user']); #trim user in case of mistake 3. $pass=trim($_POST['pass']); 4. str_replace("username", "password", $srt); 5. if (($user == "username") && ($pass="password")) { Think that the user's name is CODE "username" .If the member enters CODE " username " //there are some spaces at the beginning and end.And if you didn't use trim and directly set, like this CODE 2. $user=$_POST['user']; At the 5th line the user's name will not equals. Like this CODE if (" username "=="username") { the two value is not equal butif you used trim function CODE 2. $user=trim($_POST['user'];) and so CODE if ("username"=="username") { yes the two value is equal, because we used trim function.Briefly if you use trim, the if match will be true even the member adds around the his username.
Thanks. I think I am going to try it soon and then post a reply concerning such issues.
QUOTE(alex1985 @ Jun 15 2008, 12:47 AM) Thanks. I think I am going to try it soon and then post a reply concerning such issues. try using php's documentation. it might help you on some other issues you have in mind. http://www.php.net/docs.php
Yeah, just use http://www.php.net to search for most functions. Or if you need a different function just google it. Or ask here. Whichever you are most comfortable with.
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