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PHP - Question About Function And Parameters
This thread is about what you can and cannot call Variables and Parameters in a Function...
I have this query which returns 1 or 2 for $gender... Code: [Select] // Check # of Records Returned. if (mysqli_stmt_num_rows($stmt1)==1){ // Member was Found. // Bind result-set to variables. mysqli_stmt_bind_result($stmt1, $firstName, $username, $photoName, $photoLabel, $gender, $birthYear, $location, $occupation, $interests, $aboutMe); And here is my Function... Code: [Select] function displayGender($gender){ if ($gender == 1){ $gender = 'Male'; }elseif ($gender == 2){ $gender = 'Female'; }else{ $gender = ''; } return $gender; }//End of displayGender Questions: 1.) Is it a problem having $gender as both my Parameter and Argument? 2.) Is it a problem renaming $gender inside the Function like I do? 3.) Is it a problem returning $gender like I do? Thanks, Debbie Similar TutorialsI am making a function it returns one thing, but I would the like to put something into a variable to use outside the function. for example, the third parameter in preg_match() sets a variable that you can then use later in your code, how can I create a parameter like that? OK, in my html file, I have "${uri}" which is a directory/filename. A link (href) is created directly from "${uri}" that opens the file when clicked. This works great. <dd><a href="${uri}">${uri}</a> (${size} bytes)<br><br></dd> Now, I want to also add the ability to explor the directoy. So I want to add another link (href) with the directory only include in "${uri}". For example, if "${uri}" = '/this/is/the/directory/and/thefile.txt', I want an href w/ '/this/is/the/directory/and' I created the file dir.php w/ the following <?php function giveme_dir_only( $a ) { $mydir = dirname($a ); return $mydir; } ?> Now, how do I add this to my html/href command. There is no reason to run the dir.php until the user actually clicks on the link, eh? <dd><a href="xxxx">"xxxx"</a> <br><br></dd> Thanks in advance for the help! I am calling CURL and trying to do a POST request with parameters: Code: [Select] $curl = curl_init(); curl_setopt($curl, CURLOPT_HTTPHEADER, Array("Accept: application/json", "Content-Type: application/json")); curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 15); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true); curl_setopt($curl, CURLOPT_USERAGENT, "curl 7.23.1 (x86_64-unknown-linux-gnu)"); curl_setopt($curl, CURLOPT_USERPWD, "username:password"); curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC); curl_setopt($curl, CURLOPT_URL, "https://www.mydomain.com/route"); curl_setopt($curl, CURLOPT_POST, true); curl_setopt($curl, CURLOPT_POSTFIELDS, "key1=blah1&key2=blah2"); return curl_exec(curl); The problem, inside the request at http://www.mydomain.com/route I am not seeing any POST parameters passed. I.E. Code: [Select] print_r($_POST); Code: [Select] Array ( ) Should have key1=blah1 and key2=blah2. Any ideas? I have some function or method. Is there a better design patter to implement this?
function myFunction($a=null,$b=null,$c=null,$d=null,$e=null,$f=null,$g=null,$h=null)
{
//Do a bunch of stuff
}
Maybe the second function?
function myNewFunction($data=array())
{
$data=array_merge(array('a'=>null,'b'=>null,'c'=>null,'d'=>null,'e'=>null,'f'=>null,'g'=>null,'h'=>null),$array);
//Do a bunch of stuff
}
Please provide decision making factors why you would use one approach over the other.
I have a question about functions and what is the benefit of using a function over multiple if/else statements. For example: What would be the difference in using this function: Code: [Select] <?php function getRealIpAddr() { if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } return $ip; } ?> or just using this code: Code: [Select] <?php if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } ?> With the first example, I try to echo the ip address ($ip) to the page and nothing happens. With the second, I echo $ip and the ip address is shown on the page. Why? Am I doing something wrong or taking a shortcut that shouldn't be taken? This may seem like a silly question but I'm trying to figure this out and sometimes it's easier to just use multiple if/else statements to accomplish my task rather than an actual function. Thanks for your help. Hi I have a question about a function someone gae to me. When Im inserting data into the database from a form I always follow the same format. for example let say I have name, description number... if(isset($_POST['submit_member'])){ //trim $name = trim($_POST['name']); $description = trim($_POST['description']); $number = trim($_POST['number']); //check for errors $errors = array(); if(empty($name)) { $errors[] = "Please enter a name"; } if(empty($description)) { $errors[] = "Please enter a description"; } //mysql_real_escape_string! $name = mysql_real_escape_string($name); $description = mysql_real_escape_string($description ); $number = mysql_real_escape_string($number); then the insert into the database here ...... now if you have a lot of fields you will be repeating yourself constantly. On this basis my friend gave me this code... foreach ($_POST as $key => $value) { $$key=trim(mysql_real_escape_string(($value)); } The first question is... is my friend right and should it be written this way. The second question is what would the the data come out like eg $_POST['name']; $_POST['description']; Would they come out like.... $name $description ?????? Hi Guys. I am trying to call variables inside a function: Here is what i am trying to do, but doesnt like it? Code: [Select] function disable($var1,$var2) { if ( $var1 == "" ) { $var2="disabled"; } } disable("$form", "$select"); Cheers Hello Guys, I have a question about doing an IF statement in a function. Here is my code Code: [Select] function checkEmail($email){ return preg_match('/^\S+@[\w\d.-]{2,}\.[\w]{2,6}$/iU', $email) ? TRUE : FALSE; } How would I do the IF statement to test if the email is True or False? Is it like this? Code: [Select] function checkEmail($email){ return preg_match('/^\S+@[\w\d.-]{2,}\.[\w]{2,6}$/iU', $email) ? TRUE : FALSE; if ($email == "False") { Do something here } } Thanks for you help! When you use the sleep function in a script, will the script resume from that exact spot? I guess what I need to know is will it break an upload to MySql database of a csv file or will the whole file be uploaded? Thank All Hi, Im learning php, but Im a bit confused on this basic problem. I have the following code: <?php include "tax.php"; $price = 95; echo "Price before tax: $price <br>"; echo "Price after tax: "; echo add_tax ($price); ?> Which uses the function below <?php function add_tax ($amount) { $total = $amount * 1.09; return $total; } ?> When I execute the code I can see that it does work, but I do not understand why this part works! echo add_tax ($price); There is no multiplier symbol here, so is the function performed on the ($price) variable simply because of where it is located on this line of code? Thanks I need to create a function that lists subfolders of a given folder, that contain at least one .txt file. I found the following function, which displays a list of file that match a pattern in a directory tree: function find($dir, $pattern){ $dir = escapeshellcmd($dir); $files = glob("$dir/$pattern"); foreach (glob("$dir/{.[^.]*,*}", GLOB_BRACE|GLOB_ONLYDIR) as $sub_dir) //look in subdirectories { $arr = find($sub_dir, $pattern); //recursive call $files = array_merge($files, $arr); // merge array with files from subdirectory } return $files; } $txtFiles=find("project/sys","*.txt"); foreach ($txtFiles as $txtFile) { echo '<h2>'.$txtFile.'</h2>'; //display all text files } My question is, how do I change the function to return only folders that contain at least one text file. But, the functions should look inside child folders of "project/sys" and list a child folder only once if that folder or any of its child folders contain at least one text file. I'll give an example of the output I'm looking for: Folder list project/sys/diagram project/sys/bin project/sys/scripts project/sys/styles project/sys/meta The above folders may not contain a text file directly, but their children folders do. However, I'm not interested in their children folder and I want to list the above level folder only once for each folder. Thanks in advance Cant get it to work!! here is the code , how do i fix this? Code: [Select] <script type="text/javascript"> function popup(var) { alert(var); } </script> <?php $calendar.= "<td class='calendar-day'><div style='position:relative;height:100px;' onclick='popup('hello')'>"; ?> Hello, all: I'm a newbie and I'm trying to understand the whole php security thing a bit better, and found this function that seems easy to implement, as well as easy to understand... my question is... Does this means I could use regular $_POST, $_GET, $_COOKIE, $_REQUEST variables without having to individually worry about escaping them every time I use them in queries... is this correct? or safe enough? see example below, along with how I'm using variable in a query... it seems to be working fine, as it does echo out the \ escape character when I test it, or when I try to inject it... Appreciate your input! Code: [Select] <?php $_POST=sanitize($_POST); $_GET=sanitize($_GET); $_COOKIE=sanitize($_COOKIE); $_REQUEST=sanitize($_REQUEST); function sanitize($input){ if(is_array($input)){ foreach($input as $k=>$i){ $output[$k]=sanitize($i); } } else{ if(get_magic_quotes_gpc()){ $input=stripslashes($input); } $output=mysql_real_escape_string($input); } return $output; } // mysql query then I could use be: $money = $_GET['money']; $result = mysql_query("SELECT * FROM countries WHERE currencies = '$money'"); ?> Imagine 6 PHP classes (one each for a product line), that have very similar coding structures, that go like this:
//function that computes stuff inside each of 6 files:
//they vary slightly from file to file but essentially it is this:
function computeFunction
{
$this->x = new X();
$this->x->calcD();
if ($this->x->dOk)
{
$this->x->calcE();
$this->x->calcN();
}
//more complicated logic that is essentially like above
//and by the way!
print $this->x->someVarThatIsUsedLater;
}
Then there is a single class like so :
class X
{
function calcD()
{
//compute some condition
if (<computed condition is met>) $this->dOk = true;
else $this->dOk = false;
//and by the way
$this->someVarThatIsUsedLater = 4;
}
}
Just to bring your attention to it, none of these functions return any result or value, but they nevertheless operate on variables of key interest via side-effects. That is, they modify variables that essentially act like globals, and then use those variables later ($this->dOk and $this->someVarThatIsUsedLater are one more prominent examples).
I need to untangle this mess. And make it clean and clear again, and make sense. How do I best proceed?
I have been wrestling with some ideas... like $this->dOk, can within reason be turned into a return variable of calcD() function, and then be tested against like if ($this->x->calcD()) and I think it will be reasonable enough. But then there are other functions that don't return anything and just act on variables via side-effects anyway so $this->dOk is one of the lesser troubles...
Other than that, what I am thinking of doing is getting rid of these mini-functions (calcE(), calcN(), etc.), removing them as a funciton, and putting their body directly into the code, as a first step to refactor. Many of the computations done inside are just a few lines of code anyway, and the functions kind of hide a lot of side-effects that happen, instead of actually encapsulating the behavior. So while it may be counter-intuitive to dismantle the functions that appear to be doing something that normally can be encapsulated (computing key variables E, N, etc), I think dismantling them will actually clean things up as far as collecting all the side-effects inside a single parent function thereby making them more visible.
Caveat: while doing so I will end up with 6 copies of untangled dismantled functions, because dismantling class X and putting its content into each of the 6 product line classes will have that effect.
But my hope is that from that point I will see more clearly to start identifying places where I can start to truly encapsulating the behavior via various structures, instead of masking it.
Problems / Questions:
I would like to but I am not entirely sure that I can skip that step of dismantling functions & the 6x multiplying effect. It's probably the same like skipping steps in solving polynomial equations. Some can do it and some need to list each step of their work.
And I am not entirely sure what structures I can replace it with in the end after I dismantle the functions.
It also looks like a lot of work. Is there a better way?
P.S. I already put tests on computeFunction() for each product line so I can be less paranoid about hacking stuff up.
Edited by dennis-fedco, 19 January 2015 - 03:06 PM. Hi all, I need to get a parameter from an url, but the GET variables are passed through urldecode(). Some of my variables may have characters such as "+", ":", spaces, etc. When I use GET, all "+" are converted to spaces. I can use urlencode to get the "+" back, but also everything that was previously a space also turns into "+". Example: variable = abc+ c+:d Then I can get either: abc c :d or abc++c+:d but I want to get abc+ c+:d Would anybody know how to help me? Thanks! Hi hello, Right now I have this generated URL: mywebsite.com/thisismypage?compare0=50&compare1=112&compare2=512 Is there anyway to "extract" the 50, 112, and 512 dynamically? Those numbers are the Item ID's, I need them for further operations. So is there a way to extract the IDs, maybe into an array? The ID's are dynamically rendered, as well as the "compare#". Not sure if I am being clear... hopefully this makes sense. All help is appreciated. Thank you. Hi, I develop some functions in PL/SQL and PL/PgSQL. In these languages are IN and OUT parameters in Functions and Store Procedures. There is IN and OUT parameters in PHP Functions? Sorry my bad english. Best Regards,
Not experienced coding PHP and need help doing something which is probably very easy but looks like Mt Everest to me. FOO = 123456 BAR = abc Then, write URLs with those variables and have them work the same in a browser:
http://webpage1.com/?var1=FOO&var2=BAR
http://webpage2.com/?var1=FOO&var2=BAR
http://webpage3.com/?var1=FOO&var2=BAR If I update the fields in my local webpage and refresh browser, would like the new value(s) to be used instead. Any help with this greatly appreciated. If someone will put a file together think that I can edit and modify from there for my specific application. Thank you. Edited December 1, 2020 by XcloneIs there an alternative way to encode url params besides: base64_encode() examples would be great. Hello all, I'm kind of a noob to PHP, and as such have been teaching myself the language. I'm attempting to insert tag attributes in divs, based on whether the site is viewed in IE or Firefox, to account for subtle differences in appearance. The problem, however, is that the variable $boxorlink apparently has the value "box" the second time I call the method, even though I explicitly state "other" as the parameter; the else clause is never reached. If anybody could tell me why this is happening, please let me know. My entire HTML code is below... <html> <head> <style type ="text/css"> html { background-image:url('denim.jpg'); } .wrapper { min-width:600px; width:600px; height:800px; position:fixed; } .headertext { font-weight:bold; color:#FFFFFF; font-size:24pt; font-family:sans serif; text-shadow: 0.1em 0.1em #333 } .miniheadertext { font-weight:bold; color:#FFFFFF; font-size:16pt; font-family:sans serif; text-shadow: 0.1em 0.1em #333 } div.transbox { width:750px; height:180px; margin:30px 50px; border-style:solid; border-color:#c0c0c0; background-color:#000000; /* for IE */ filter:alpha(opacity=30); /* CSS3 standard */ opacity:0.3; } div.currentpagelink { width:90px; height:22px; margin:30px 50px; background-color:#c0c0c0; font-color:#FFFFFF; font-weight:bold; font-size:14pt; font-family:sans serif; text-align:center; /* for IE */ filter:alpha(opacity=40); /* CSS3 standard */ opacity:0.4; } } div.otherpagelinks { width:100px; height:50px; font-size:14pt; font-family:sans-serif; } </style> <title> Marvin Serrano's Online Portfolio </title> <?php function checkBrowser($boxorlink, $left, $top, $displaceleft, $displacetop) { //new positions for Firefox $newleft = $left + $displaceleft; $newtop = $top + $displacetop; //positions for links... $newlinkleft = $left - $displaceleft; $newlinktop = $top - $displacetop; //checks for box on top or links; links have to be certain % from top. if ($boxorlink = 'box') { if (strpos($_SERVER['HTTP_USER_AGENT'],'MSIE') !== FALSE) { echo('left:'.$left.'%'); } else { echo('left:'.$newleft.'%'); } } elseif ($boxorlink = 'other') { if (strpos($_SERVER['HTTP_USER_AGENT'],'MSIE') !== FALSE) { echo('left:'.$left.'%;'.'top:'.$top.'%'); } else { echo('left:'.$newlinkleft.'%;'.'top:'.$newlinktop.'%'); } } } ?> </head> <div class="wrapper"> <div class ="transbox" style="position:absolute; <?php checkBrowser('box',19,0,9,0) ?>"> <div class ="headertext" style="position:absolute; left:30%; top:30%">MARVIN SERRANO</div> <div class ="miniheadertext" style="position:absolute; left:29%; top:55%">Live for today, dream for tomorrow.</div> </div> <div class ="currentpagelink" style="position:absolute; <?php checkBrowser('other',38.1,26.3,10.1,3) ?>"> Home </div> <div class="otherpagelinks"> </div> </div> </html> -Marvin |
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