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PHP - Help With Shorthand If Statements
I always have trouble reading shorthand statements, as i am used to always using brackets. So when i view someones code and they use shorthand, i get confused. Can i get a clear explanation on the example below:
if ( have_posts() ) : while ( have_posts() ) : the_post(); the_content(); endwhile; else: echo "<p>Sorry, no posts matched your criteria.</p>"; endif;I've always been accustomed to using brackets, so i have trouble understanding the above quickly. Similar Tutorials*Mods* PLEASE don't move this to the OOP section again. I've had no luck there, and it's not specifically an OOP question. Hi everyone, I just want to know if there's a shorthand way to create objects, as there is for arrays: Code: [Select] // shorthand array creation $foo = array( 'bar' => 0, 'baz' => array ( 'name' => 'Dave', 'gender' => 'male' ) ) Code: [Select] // is there a way to do this with objects? // not that I know so far... $foo = object( bar->0, 'baz' -> object ( name -> 'Dave', gender -> 'male' ) ) I find object-access syntax is often quicker and easier to write than array-access syntax. Have I missed something obvious that I can't just write it out this way? Cheers, Dave Please bear with me in the following exercise. I'm fairly new to php (but not coding) and am trying to push my skills for the future, so I'm going beyond a problem for which I already have a solution to see if I understand the coding principles correctly. I am trying to understand just how far I can push the ternary operator shorthand. I know how to do simple tasks, but I'm wondering if I can perform more than one command in the same statement? I'm a little confused because I'd like to both set a session variable and do a page redirect and I have a feeling that the order of these operations matters, so all I've done here may be incorrect. I have a form on the front page of my site that includes a checkbox that is required in order to enter the site. The form action goes to a page where this is checked, a $_SESSION variable is set, and the page is redirected. I am also not sure if I need the session_write_close(); command, or if it is in the right place. In the full length version, it could be moved into the set of commands following the IF. Here is the full length code that I would like to translate into shorthand: Code: [Select] <?php session_start(); if (isset($_POST['ConsentCheckbox']) { $_SESSION['Consented'] = 'true'; header('Location: http://www.mySite/welcome'); } else { header('Location: http://www.mySite/errors/NotConsented'); } session_write_close(); ?> The if/else conditions translate easily into these two lines of code, which could be one line if I didn't also need to set the session variable: Code: [Select] <?php session_start(); $_SESSION['Consented'] = isset($_POST['ConsentCheckbox']) ? 'true' : 'false'; header('Location: http://mySite.com/'.($_SESSION['Consented'] ? 'welcome' : 'error/NotConsented')); session_write_close(); ?> But, I really only need to set the $_SESSION variable if the $_POST['ConsentCheckbox'] is set. This makes the test on the following pages of my site much simpler (where I test to see if the $_SESSION variable is set and then either redirect to the consent form or load the desired page). SO, I'm wondering if it can be further condensed. I've come up with these possibilities, but am not totally sure. This has now become a theoretical exercise in coding for me. Here is what I think is possible, but I have a couple of outstanding questions, so I'd like some input, please. I first translated it into the following. I think this is correct, although I'm not sure if I need brackets around the multiple commands in the TRUE section. Code: [Select] <?php session_start(); isset($_POST['ConsentCheckbox']) ? $_SESSION['Consented']='true'; header('Location: http://www.mySite.com/welcome') : header('Location: http://www.mySite/errors/NotConsented'); session_write_close(); ?> Then, I wondered if I can even further condense it in the following way? Here is where the order of the commands is likely to break the code - and I'm not entirely sure that my use of double quotes will suffice instead of escaping out the end bracket of the header() command: Code: [Select] <?php session_start(); header('Location: http://www.mySite.com/'.(isset($_Post['ConsentCheckbox']) ? "welcome')"; $_SESSION['Consented'] = 'true' : "errors/NotConsented')"); session_write_close(); ?> Have I gone too far? Thanks
Is there a shorthand for:
This obviously doesn't work (but I tried it anyway 😃 )
.... I also tried every permutation of: Maybe a stupid question... after typing it out, if($dog!='bark') exit('go away'); looks pretty short already. I am trying to write an if statement that checks to make sure the information put in the text box is an imbedded file. Does anyone know how to do that? The below is constantly loading the password page no matter what is enter in the password input on the form (on another page). I have checked the $login variable by echoing it and it is carrying the value from the field. <?php $off="yes"; $login=$_POST['login']; if($off=="yes" && (!isset($_SESSION['login']) || $_SESSION['login']!="pass")){ if($login=="" || $_SESSION['login']!="pass"){ header('Location: ./index2.html'); exit(); } elseif(!isset($_SESSION['login'])){ session_start(); $_SESSION['login']=$login; header('Location: ./index.php'); exit(); } } elseif($off=="no" || $_SESSION['login']=="pass"){ content goes here. } ?> Anything wrong with this because I got a parse error ONLY after adding to create this. <?php $visible = array('Yes', 'No'); foreach($visible as $visible): $visible2 = array('yes', 'no'); foreach($visible2 as $visible2): ?> Hello, I am learning PDO SQL statements, I have mananged to connect using PDO: Code: [Select] try { $this->link = $dbh = new PDO('mysql:host='.$this->dbhost.';dbname='.$this->dbname.'', $this->dbuser, $this->dbpass); } catch (PDOException $e) { echo 'Connection failed: ' . $e->getMessage(); } I am not getting any error, so I guess that is a good start. I then tried the PDO SQL statement out. My old mySQL query is commented out in the Code: [Select] if (isset($_SESSION['id']) && isset($_SESSION['password'])) { $_SESSION['id'] = ( isset( $_SESSION['id'] ) ) ? $_SESSION['id'] : FALSE; $_SESSION['password'] = ( isset( $_SESSION['password'] ) ) ? $_SESSION['password'] : FALSE; //$logged = mysql_query("SELECT * FROM `db_members` WHERE `id`='".$_SESSION['id']."' AND `password` = '".$_SESSION['password']."'"); //$logged = mysql_fetch_array( $logged ); // the new pdo statement $ff = $dbh->prepare('SELECT * FROM db_members WHERE id = '.$_SESSION['id'].' AND password = '.$_SESSION['password'].''); $ff->execute(); $logged = $ff->fetchAll(); echo $logged['username']; } I am trying to assign the session to logged variable. So all I am asking is go into db_members and check the id and password that is the same as session id and password and collect the rows data such as username. My login script and everything works perfectly, even session id and password is valid when echo'd but I cannot assign it to the logged variable like my old sql statements. Code: [Select] $logged = mysql_query("SELECT * FROM `db_members` WHERE `id`='".$_SESSION['id']."' AND `password` = '".$_SESSION['password']."'"); $logged = mysql_fetch_array( $logged ); I used other PDO statements and it works perfectly but I just don't understand why this is not working.... can I please get some help if you have any solution to this? Hi Guys, Newbie trying to understand PHP conditionals. In the below Code: [Select] [[*id]] is a global variable which equates to my current page id so it could have the value of 1 for example. I tested it using echo and the correct values pass to it in the cms I'm using. What I cant achieve is for the conditionals below to work correctly so perhaps you can see a syntax error or show me away of doing the same using an array or something perhaps? THANKS Code: [Select] <?php $id='[[*id]]' if ($id=="1" || $id=="2") echo "we are in 1 or 2"; elseif ($id=="3" || $id=="4") echo "we are in 3 or 4"; else echo "not in 1 to 4"; ?> Hey guys, is there any way to have a LIKE condition on an IF statement? Something like: Code: [Select] if $GET_['WTV'] LIKE %LOVE% { $category=romance Any clues? Thanks in advance. Hey Guys, I am creating an array and I have a need to put a if statement inside it. Is this even possible? Here is where I am at so far, its just not working. function load_permissions($gid) { $data = array(); $this->db->select('`groups`.`name` AS `permission_name`, `permissions`.``'); $query = $this->db->get('`groups`,`permissions`'); if ($query->num_rows() > 0){ foreach ($query->result_array() as $row){ $data[] = array( "name" => $row['permission_name'], "read" => if($row['level'] >= 1) { img("img/true.gif") } else { img("img/false.gif") }, ); } } $query->free_result(); return $data; Thanks, Peter How to write 2 "if" statements together? if($userResult==$myResult) and ($userResult<0) { Hi There, Im trying to figure out how to do this if/else statement. I need it to say, "if this is true, do this. if this is true, do this. If neither is true, do this. So there are three different possible outcomes. I tried to put each new if inside of the previous else. but that doesn't seem to work. $firstname = $_REQUEST['firstname']; $lastname = $_REQUEST['lastname']; if ($firstname == 'Joey' and $lastname == 'Hodara') { $output = 'Welcome to our site, ' . htmlspecialchars($firstname, ENT_QUOTES, 'UTF-8') . ', Oh Glorious Leader!'; } else { if ($firstname == 'Matt' and $lastname == 'Fig') { $output = 'Welcome to our site, ' . htmlspecialchars($firstname, ENT_QUOTES, 'UTF-8') . ', Portagee!'; } else{ if ($firstname == 'Jon' and $lastname == 'Spense') { $output = 'Welcome to our site, ' . htmlspecialchars($firstname, ENT_QUOTES, 'UTF-8') . ', bro!'; } } $output = 'Welcome to our site, ' . htmlspecialchars($firstname, ENT_QUOTES, 'UTF-8') . ' ' . htmlspecialchars($lastname, ENT_QUOTES, 'UTF-8') . '!'; ?> Hello, I'm currently working on just a quick little frontend for VirtualBox and I'm just running into a little bit of a problem that I can't find my way around. Now this is my first project in php. I'm familiar with programming concepts (well except this one apparently ) and by familiar were talking I like to tinker with small languages.. no formal training. Anyway, here we go. So heres the main page. Pretty simple, you type the argument that goes with the following command and check the box next to the command you'd like to execute. Code: [Select] <HTML> <HEAD> <TITLE>LCCP ver1</TITLE> </HEAD> <BODY> <?php include "header.php"; ?> <form method="post" action="lccp_ver1.php"> <p>cmd="createvm"<br> Enter the name of the Virtual Guest you'd like to create: <input type="text" name="id"> <input type="checkbox" name="createvm"> </p> <p>cmd="showvrtinfo"<br> Enter the name of the Virtual Machine you'd like to view: <input type="text" name="id2"> <input type="checkbox" name="showvminfo"> </p> <p>cmd="unregistervm"<br> Enter the name of the Virtual Guest you'd like to delete: <input type="text" name="id3"> <input type="checkbox" name="unregistervm"> </p> <p>cmd="startvm"<br> Enter the name of the Virtual Machine you'd like to start: <input type="text" name="id4"> <input type="checkbox" name="startvm"> </p> <p>cmd="controlvm"<br> Enter the name of the Virtual Machine you'd like to control: <input type="text" name="id5"> <input type="checkbox" name="controlvm"> </p> <p>Then.. would you like to...</p> <p>arg="pause" <input type="checkbox" name="controlvm_pause"></p> <p>arg="resume" <input type="checkbox" name="controlvm_resume"></p> <p>arg="reset" <input type="checkbox" name="controlvm_reset"></p> <p>arg="poweroff" <input type="checkbox" name="controlvm_poweroff"></p> <p>arg="savestate" <input type="checkbox" name="controlvm_savestate"></p> <input type="submit" name="Submit" value="Submit"> </form> </BODY> </HTML> And then here is the execution page Code: [Select] <HTML> <HEAD> <TITLE>LCCP command <?php function ServerLoad() { $stats = exec('uptime'); preg_match('/averages?: ([0-9\.]+),[\s]+([0-9\.]+),[\s]+([0-9\.]+)/', $stats, $regs); return ($regs[1].', '.$regs[2].', '.$regs[3]); } echo ServerLoad(); ?> </TITLE> </HEAD> <BODY> <?php include "header.php"; ?> <?php function createvm($id) { $output = shell_exec("VBoxManage createvm --name " . $id . " --register"); return $output; } function showvminfo($id) { $output = shell_exec("VBoxManage showvminfo " . $id); return $output; } function unregistervm($id) { $output = shell_exec("VBoxManage unregistervm ". $id ." --delete"); return $output; } function startvm($id) { $output = shell_exec("VBoxManage startvm ". $id ." --type headless"); return $output; } function controlvm($id,$arg) { $output = shell_exec("VBoxManage controlvm ". $id ." ". $arg); return $output; } function print_output($output) { echo' <pre>'. $output . ' </pre>'; } //******************exec main********************** if (isset($_POST['createvm'])) { // createvm($_POST['id2']); print_output(createvm($_POST['id'])); } if (isset($_POST['showvminfo'])) { // showvminfo($_POST['id']); print_output(showvminfo($_POST['id2'])); } if (isset($_POST['unregistervm'])) { // unregistervm($_POST['id3'); print_output(unregistervm($_POST['id3'])); } if (isset($_POST['startvm'])) { // startvm($_POST['id4']); print_output(startvm($_POST['id4'])); } if ((isset($_POST['controlvm'])) AND (isset($_POST['controlvm_pause'))) { //controlvm($_POST['id5']," pause"); print_output(controlvm($_POST['id5']," pause")); } if ((isset($_POST['controlvm'])) AND (isset($_POST['controlvm_resume'))) { //controlvm($_POST['id5']," resume"); print_output(controlvm($_POST['id5']," resume")); } if ((isset($_POST['controlvm'])) AND (isset($_POST['controlvm_reset'))) { //controlvm($_POST['id5']," reset"); print_output(controlvm($_POST['id5']," reset")); } if ((isset($_POST['controlvm'])) AND (isset($_POST['controlvm_poweroff'))) { //controlvm($_POST['id5']," poweroff"); print_output(controlvm($_POST['id5']," poweroff")); } if ((isset($_POST['controlvm'])) AND (isset($_POST['controlvm_savestate'))) { //controlvm($_POST['id5']," savestate"); print_output(controlvm($_POST['id5']," savestate")); } //**********working on*************** //teleport? ?> </BODY> </HTML> Now my question is with the if statements. Well, number one I guess is there a more efficient way of doing this that I'm overlooking? I looked into switches but I don't know how I'd pull that off with checkboxes without some complicated loop and somehow converting the checkboxes "yes" or "nos" into numbers or something. If statements just seemed like less of a headache but I may be finding otherwise haha. Number two here is how do I get the "controlvm" command to work? When I comment out that last indented lines of if statements the program runs perfect (and thats with the controlvm function as well. so.. the problem isn't there). Basically whats the appropriate way to do this. I'm stuck and my limited program knowledge and Google searching is starting to run thin. Thanks in advance for the help! Hi, What is a shorter way instead of having all these if statements? Here it is: Code: [Select] if($matchno==1) return 66; elseif($matchno==2) return 67; elseif($matchno==3) return 68; elseif($matchno==4) return 69; elseif($matchno==5) return 70; elseif($matchno==6) return 71; elseif($matchno==7) return 72; elseif($matchno==8) return 73; elseif($matchno==9) return 74; elseif($matchno==10) return 75; elseif($matchno==11) return 76; elseif($matchno==12) return 77; elseif($matchno==13) return 78; elseif($matchno==14) return 79; elseif($matchno==15) return 80; elseif($matchno==16) return 81; elseif($matchno==17) return 82; elseif($matchno==18) return 83; elseif($matchno==19) return 84; elseif($matchno==20) return 85; elseif($matchno==21) return 86; elseif($matchno==22) return 87; elseif($matchno==23) return 88; elseif($matchno==24) return 89; elseif($matchno==25) return 90; elseif($matchno==26) return 91; elseif($matchno==27) return 92; elseif($matchno==28) return 93; elseif($matchno==29) return 94; elseif($matchno==30) return 95; elseif($matchno==31) return 96; elseif($matchno==32) return 97; someone please code shorter? I will learn this way. Thanks. Okay i'm trying to compare these sets of variables. code looks like this.. Code: [Select] if( $row->cash > $finalcash && $row->core1 > $finalcore1 && $row->core2 > $finalcore2 && $row->core3 > $finalcore3 && $row->core4 > $finalcore4 ) { return true; } else { return false; } First question is this the appropriate way of doing this? Or would a nested if statement work better? example: Code: [Select] if ($row->cash > $finalcash) { if ($row->core1 > $finalcore1) { if ($row->core2 > $finalcore2) { if ($row->core3 > $finalcore3) { if ($row->core4 > $finalcore4) { } else { return false; } } else { return false; } } else { return false; } } else { return false; } } else { return false; } I know it looks pretty messy, so i'm wondering if anybody is aware of an alternative to achieving this? Todays date is between the criteria in if else, but it is not catching it. Code: [Select] <?PHP $today = date('Y-m-d'); $sunday = date('Y-m-d', strtotime('last Sunday', strtotime('last Saturday'))); $saturday = date('Y-m-d', strtotime('last Saturday')); $firstday = date('Y-m-d', strtotime('next Sunday', strtotime('last Friday', strtotime('first day of last month')))); $lastday = date('Y-m-d', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of this month')))); $thisfirstday = date('Y-m-d', strtotime('next Sunday', strtotime('last Friday', strtotime('first day of this month')))); $thislastday = date('Y-m-d', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of next month')))); echo"$today<hr />$firstday<br />$lastday<hr />$thisfirstday<br />$thislastday"; if($firstday>="$today" && $lastday<="$today") { $month = date('m', strtotime('-10 days', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of this month'))))); $year = date('Y', strtotime('-10 days', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of this month'))))); echo"1<br />$month|$year"; } elseif($thisfirstday>="$today" && $thislastday<="$today") { $month = date('m', strtotime('-10 days', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of next month'))))); $year = date('Y', strtotime('-10 days', strtotime('next Saturday', strtotime('last Friday', strtotime('first day of next month'))))); echo"3<br />$month|$year"; } ?> output: Code: [Select] 2011-10-10<hr />2011-08-28<br />2011-10-01<hr />2011-10-02<br />2011-10-29 I need to insert a large variable number of records into a mysql table. I can do this using a while loop and insert queries in the loop but its slow and ive been given to understand its a bad idea. I have heard that I can insert multiple rows with one query, but how to construct the query? This code can perfectly and reliably display a statement with echo: Code: [Select] <?php $querytestquery='"INSERT INTO test(qval1, qval2) VALUES'; echo $querytestquery; $querymax=10; $querystart=0; while ($querystart<$querymax) { $qval1=1*$querystart; $qval2=2*$querystart; $queryadd="($qval1, $qval2)"; echo $queryadd; if ($querystart<$querymax-1) { echo ','; } $querystart++; } echo '"'; ?> "INSERT INTO test(qval1, qval2) VALUES(0, 0),(1, 2),(2, 4),(3, 6),(4, ,(5, 10),(6, 12),(7, 14),(8, 16),(9, 18)" But I don't understand how to set a variable equal to the displayed query so that I can have php construct the statement based on the values and the number of records I want to update or insert. this is working fine : Code: [Select] while($tags=mysql_fetch_array($d_b->sql_answer,MYSQL_ASSOC)){ echo $tags['tag_name'] . "<br/>"; } display : Code: [Select] html css javascript c++ php but when i try to do some sql statements inside like this : Code: [Select] while($tags=mysql_fetch_array($d_b->sql_answer,MYSQL_ASSOC)){ $sql="SELECT * FROM user WHERE user_languages LIKE '% {$tags[tag_name]} %'"; //to apply the $sql $d_b->apply($sql); //number of results $num=$d_b->num_rows(); $sql="UPDATE tags SET tag_folowers={$num}"; $d_b->apply($sql); } it return an error : Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given If my SQL statement returns a result I want to change the background color of a cell. If the user is logged in I want to then show one of two buttons. either book, or cancel, depending on whether the cell is available or not. So far I have this: $sql = "SELECT * FROM diary WHERE day = '$mon' AND studio_id ='mon11'"; $query = mysql_query($sql) or die (mysql_error()); if (mysql_num_rows($query) < 1) { $bgcolour= '#5DFC0A'; if(isSet($_SESSION['logged'])) { $book = '<form action="../book.php" method="POST"><input type="hidden" name="day" value='.$mon.' type="text"/><input type="hidden" name="month" value='.$month.' type="text"/><input type="hidden" name="year" value='.$year.' type="text"/><input type="hidden" name="book_id" value="mon11" type="text"/><input type="submit" name="submit" value="Book!"></form>'; }} else { $bgcolour= '#FF0000'; } if(isSet($_SESSION['logged'])) { $book = '<form action="../cancel.php" method="POST"><input type="hidden" name="day" value='.$mon.' type="text"/><input type="hidden" name="month" value='.$month.' type="text"/><input type="hidden" name="year" value='.$year.' type="text"/><input type="hidden" name="book_id" value="mon11" type="text"/><input type="submit" name="submit" value="Cancel!"></form>'; } echo "<td rowspan='3' bgcolor=".$bgcolour.">"; if (isset($book)) { echo $book; } I want to use the $session(logged) variable to show the appropriate button, but I can't get it to work in the other if statement, Any ideas? i have been trying to make this work for days, this needs to also include a discount for staying over >=5 days in Tokyo, no matter what i do i always gets syntax error this class is making me crazy how do i go about getting the discount in this????? please help <?php $destination = $_POST['destination']; $numTravelers = $_POST['numTravelers']; $numNights = $_POST['numNights']; $airFare = $_POST['airFare']; $hotel = $_POST['hotel']; if ($destination == Barcelona) {$airFare = 875.00; $perNight = 85.00;} elseif ($destination == Cairo) {$airFare= 950.00; $perNight = 98.00;} elseif ($destination == Rome) {$airFare = 875.00; $perNight = 110.00;} elseif ($destination == Santiago) {$airFare = 820.00; $perNight = 85.00;} elseif ($destination == Tokyo) {$airFare = 1575.00; $perNight = 240.00;} this is where i can not figure out how to put in the discount off the airfare for staying over five days elseif ($destination == Tokyo && $numNights >=5) $tickets = $numTravelers * $airFare; $hotel = $numTravelers * $numNights * $perNight; $totalCost = $tickets + $hotel; print("<p>Destination: $destination<br />"); print("Number of people: $numTravelers<br />"); print("Number of nights: $numNights<br />"); print("Airline Tickets: $".number_format($tickets, 2)."<br />"); print("Hotel Charges: $".number_format($hotel, 2)."</p>"); print("<p><strong>TOTAL COST: $".number_format($totalCost, 2)."</strong></p>"); ?> |
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