Do We Need This Functions?
I'd like to check with others what are the least used functions in PHP, since I think that it is becoming more and more filled with unuseful addons while missing useful extensions like SOAP (to name one).
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I have a serious problem, that I hope you here at DevShed can help me out. I have been using PHP for a while now and I love it, I think its a great language. I have learnt quite a lot already...but there is one thing that I have had trouble with and thats writing my own FUNCTIONS! Im fine with the built in functions etc, but I just cant get my head around bloody USER DEFINED FUNCTIONS! I have read books, completed many tutorials and just when I think I have it sewn up, something else crops up and Im back where i started. I would be very grateful if someone could take me through the workings/example of a custom function. e.g - echoing in a function, returning values.
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Functions!!
What I've done is I've got some code which displays the question and the wrong answer, however I'm trying to email the user who has set up the quiz, the info, which includes the wrong questions. The thing I don't want to repeat the code, but rather place this in a function, but it looks rather tricky, when I try to implement this. Code:
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Functions...
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Where does one learn about adding functions to PHP, not for development, more for personal, I know how to write functions in a PHP script, but where can I learn to write "global" functions?
Rename Functions
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Using The File Functions
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Variables Within Functions
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Certain Functions Don't Work
I have just installed php on windows 2000 and it's working fine. But there are some functions that work and some that don't. For eg: "mysql_fetch_array" will work fine but "in_array" will not work. Is there something more that I have to install so that these functions too can work?
IMAP Functions
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I've inherited some code, which is not working as it is supposed to. The way it's implemented has me confused. It looks something like this:
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" "; } else { //we are in the root directory, so display the path echo "Current directory is now: " . ftp_pwd($conn_id) . " "; } function create_dir_tree() { global $conn_id; $files = ftp_nlist($conn_id, ""); //get files in directory if(is_array($files)) { //display a link to the parent directory echo "<br /><a href=index.php?&act=cdup&dir=" . ftp_pwd($conn_id) .. ">parent directory</a>"; foreach ($files as $file) { $isfile = ftp_size($conn_id, $file); if($isfile == "-1") { //Is it a directory? (as opposed to a file) //display a link to each child directory $string = "<br /><a href=index.php?&dir=" . ftp_pwd($conn_id) . "/" . $file . ">" . $file . "</a>"; //replace any double slashes with single slashes $url = preg_replace("////", "/", $string); print $url; } } } else echo "<br /><a href=index.php?&act=cdup&dir=" . ftp_pwd($conn_id) . ">parent directory</a>"; } ?> <html> <head></head> <body> <table border="1" cellSpacing="3" cellPadding="3" width="100%"> <tr> <td> <?php create_dir_tree(); ?> </td> <td> <form method="post" action="create_text.php"> <table border="1" cellSpacing="3" cellPadding="3" width="100%"> <tr> <td> <ul> <li><input type="checkbox" id="all" name="all">* (all spiders)</input></li> <li><input type="checkbox" id="googlebot" name="googlebot">googlebot</input></li> <li><input type="checkbox" id="askjeeves" name="askjeeves">askjeeves</input></li> <li><input type="checkbox" id="slurp" name="slurp">inktomi slurp</input></li> <li><input type="checkbox" id="scooter" name="scooter">altavista scooter</input></li> <input type="hidden" name="path" value="<?php echo ftp_pwd($conn_id) ?>"></input> </ul> </td> </tr> <tr> <td align="center"> <input type="submit" value="Submit"></input> <input type="hidden" name="activity" value="logging_in"></input> </td> </tr> </table> </form> </td> </tr> </table> </body> </html> <?php // close the connection ftp_close($conn_id); ?>
Help With Imap Functions
imap_fetchstructure -- Read the structure of a particular message a query about this function..... (from php manual) Description object imap_fetchstructure ( resource imap_stream, int msg_number [, int options]) This function fetches all the structured information for a given message. The optional flags parameter only has a single option, FT_UID, which tells the function to treat the msg_number argument as a UID. The returned object includes the envelope, internal date, size, flags and body structure along with a similar object for each mime attachement. The structure of the returned objects is as follows: so if i call imap_fetchstructure($imapstream, $msgNum, FT_UID) it will treat $msgNum as a messageID?? yes or no and if no then how do i get this to work. "The optional flags parameter only has a single option". to be hoonest i do not understand this optonal flags section.
Financial Functions
Are there any existing financial functions such as PV, NPV, IRR etc? I could write the functions my self using PHP, but having prebuilt functions makes my work easier...
Queries, Functions
i am getting one of those 'mysql_fetch_object(): supplied argument is not a valid MySQL result resource' errors with the following code. the query is valid, because if i echo itself outside the function it prints the results, but if i call the function i get the error. here's the code on my php file. PHP Code:
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