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PHP - Does Interfaces Include Default Definitions?
Do interfaces in PHP include default methods, which are available in Java 7 and 8. Default methods allow you to add default functionality in the interface itself. So when a class implements it, it can use the default definition from the interface. This is in contrast to an abstract method which has no method body.
Similar TutorialsSo I have been writing PHP constantly for a few months now, and have a pretty good grasp on OOP coming from other languages. One thing I never really use is interfaces, I get it when a class implements an interface, that class is required to have implemented methods from a interface, or a constant that is required by an interface. Seems like the kinda thing you would need when you are on a large team mainly for naming consistency? Is this something I should be using? I know I can get away with not using it, but should I use it to be up to modern php standards?
Thanks
I got a good one for you guys, I run 20 or so websites on my server all that have very similar coding structures. On all sites, I have a php script for a mysql table that logs visitors and I filter out bots(google, yahoo, etc, as many as I know of), but since many new ones are discovered weekly/monthly, I hate manually going through all sites and adding the new bot to the array of existing bots for detection. I know there are a few ways to do this, but I'd like to know the most efficient way of basically doing one function/task/opertation and it automatically updating all website's to know the new bots without manually modifying all 20 php files every time. The sites are all on the same server, but at different domains. a few ideas, which are prob not the best 1) have a universal text file that I could update that would be located in some file on one of my sites that just has a list of all bots and then each site would read from that text file to know what bots to filter. 2) have a huge php file to execute that has all connection info/passwords for every site and runs a php script to update the corresponding website's mysql table that would hold each bot as a row in the table. the script would just add a new row with the new bot info. so then ultimately when logging visitors, it would have to read the database each time 3) try to "include" a universal .php file that's located on one of my sites that has the array of all bots. But I've tried to include a file from another domain and I know that's a security error and won't include the file as a .php, but rather the file after it's been processed. There's gotta be a better solution. any ideas? What is the purpose of using an Interface in OOP? I understand the textbook definition, but am not getting the extra value that they provide... TomTees Hello, all: I have been having these odd display stuff when I'm either trying to display or call functions or definitions. Seems like they work best when ALWAYS using echo to call them, though they also work without it?? So, what gives? when or how should I use them??? Should Definitions or Functions always be used along with ECHO?? as you can see slightly confused... EXAMPLE: // Why does this line work??? note, see here I'm using echo several times in order to display right) <?php if(RIGHT_COLUMN_WIDTH != '0') { echo "<td valign='top' width='" . RIGHT_COLUMN_WIDTH . "px'>"; echo categories(); echo "</td>";} ?> // But this one doesnt display just right?? Note: see echo not used when categories() function is called, but isnt it still being called by first echo?? <?php if(RIGHT_COLUMN_WIDTH != '0') { echo "<td valign='top' width='" . RIGHT_COLUMN_WIDTH . "px'>" . categories() . "</td>";} ?> Hi, I am trying to get my head around classes, interfaces and methods for different animals
this is what I have so far:
<?php
interface animal {
function walk();
function fly();
function swim();
}
class monkey implements animal{
const interface1 = "I am from test class";
function noise() {
echo "ooh ooh ah ah!";
}
function walk() {
echo "monkey is walking";
}
function fly() {
echo "monkey is Flying";
}
function swim() {
echo "monkey is Swimming";
}
public function display() {
echo monkey::interface1;
echo PHP_EOL;
}
}
class bear implements animal{
const interface1 = "I am from test class";
function noise() {
echo "Grrr!";
}
function walk() {
echo "Bear is walking";
}
function fly() {
echo "Bear is Flying";
}
function swim() {
echo "Bear is Swimming";
}
public function display() {
echo bear::interface1;
echo PHP_EOL;
}
}
$Obj = new monkey();
$Obj->display();
$Obj1 = new bear();
$Obj1->display();
?>
I'm a bit stumped as animal interface not calling all functions?! please help I am working on a module that receives some info and provides dimensions and weights of products to the caller.
The way I get those is from existing Excel tables used by the company. Some product types have their dimensions only. Some have both dimensions and weights. To clarify - all products have both weight and dimensions but not all are specified on the Excel tables that I am using. so say "Apple" has dimensions on 1 x 1 x 1, but no weight is given. (Weight can be computed separately and in fact there is an existing class that does this already for Pear.). and "Pear" has dimensions 2 x 1 x 1 and weighs 1lbs. In short, some classes have both getWeight() and getDimensions() methods, like Pear(), and some classes just have getDimensions(), like Apple(). I am confused as to which way to go. I can create PearDimensions() class and PearWeight() and separate concepts of "weight" and "dimensions" some more and use a DimensionFactory() and WeightFactory() to instantiate the right object for the circumstances, or I can use "implements" WeightAwaretInterface and HeightAwaretInterface on Apple/Pear classes and leave them as is, thus mixing up the Weight/Dimension getters/causes. So in short I am a tad confused and wondering if there is just a good way to maintain these. Right now I am using DimensionFactory() and WeightFactory() and instantiate Pear class twice (once in each factory) since Pear has both getWeight() and getDimensions() methods. I feel weird creating the same Pear object in both factories. Do you have a recommendation for this, or do I just "hack it" (i.e. leave it as is)? Would someone help me out with Abstract Classes and Interfaces... Some questions... 1.) When you have an Interface with Methods, then any Concrete Class that "implements" said Interface must include all of the listed Methods, correct? 2.) When you have an Abstract Class with Properties & Methods, are you required to use all of the listed Properties & Methods similar to how an Interface works? 3.) What is the intent of using Abstract Classes vs. Interfaces? TomTees Hi Still a new comer when it comes to PHP. I have a situation where I want to use an include within an include and I am having trouble with my file paths. My main header include, includes everything for each page of my site, beyond the opening of the body to incorporate my navigation etc conditionally loading in css, and loading in titles and meta data etc depending on the page in question. This header needs to reference another include called the-pod.php which is required for every page, the only trouble is I want to use / to reference the root of the server and this is breaking my code. I can't use ../../ etc as its a different path depending on where the master file is located. So my question is how do I get around this? Can the root of the server or path to the root be stored in a variable? and if so how would I write this. Any tips / advice will be greatly appreciated. Hi Guys.. Merry Christmas Im kinda new to this fantastic world of PHP and i have a little problem i hope you can help me with. Im trying to build a website where I use include() to genereate my content. On my index.php i have a menu which includes content in a content div from external .php pages, my structure kinda goes like this.. (simplified) site/ index.php content/ fronpage.php products.php contact.php The HTML looks like this. <div id="menu"> <ul> <li><a href="index.php?page=frontpage">frontpage</a></li> <li><a href="index.php?page=products">frontpage</a></li> <li><a href="index.php?page=contact">frontpage</a></li> </ul> </div <div id="main"> <?php include('/content/'.$_GET['page'].'.php'); ?> </div> This all works very fine, but my problem is, can I have a include inside an already included page? I would like to have a menu on my products.php site, but that page is already included from above, and i would like the menu on the products.php site to stay as the content from the nested include changes with input from the /products folder. my idea was something like this. site/ index.php content/ frontpage.php products.php contact.php products/ product1.php product2.php the HTML on the index.php is the same as above and then i would add the include() on the products.php page, so its kinda the same thing, but one inside the other. HTML inside the products.php folder <div id="sub_menu"> <ul> <li><a href="#">frontpage</a></li> <li><a href="#">frontpage</a></li> <li><a href="#">frontpage</a></li> </ul> </div <div id="sub_main"> <?php include('/content/products'.$_GET['#'].'.php'); ?> </div> I dont know how to link to the new files so they will be included while the first include still stays on the page. Any of you know how and if this can be done? Or maybe at better way to do it? Hope this made sense, my first PHP question Thanks CanI put one INCLUDE statement INSIDE of another INCLUDE statement? When I put this above all else in my document and test it offline, all I see is code in the browser. But when I test it on my web server, I can view the markup and whatnot. Does anyone know why this is? In a Switch statement, can you give the Default: a specific name, maybe like this... switch ($resultsCode){ // Missing Primary Key. case 'COMMENT_MISSING_KEYS_2050': echo '<h1>System Error</h1>'; echo '<p>A Fatal Error has occurred. Please contact the System Administrator. (2050)</p>'; break; default 'DEFAULT_CATCHALL_ERROR_CODE_9999': echo '<p>You have reached the catch-all error code... (9999)</p>'; break; Debbie I have a few dropdown forums and would like it to select the current values that are requested. Code: [Select] global $filename,$fileid,$filetype,$filedir,$fileby; global $months,$pg; echo "<h2>Search Files</h2>"; echo "<p>"; echo "<form name = 'File_Search' action = '#' method = 'POST'>"; echo "<table border=\"0\" width=\"100%\"><tr>"; echo "<td>File Name<br><input type = 'text' name = 'name'></td><td>File Type<br><select name = 'type'> <option value = '0'>All Types</option> <option value = 'o'>Official Files</option> <option value = '1'>Quests</option> <option value = '2'>Graphic/Spritesheets</option> <option value = '3'>Entity/Scripts</option> <option value = '4'>Sound/Music</option> <option value = '5'>QuestPack/Programs</option> <option value = '6'>Miscellaneous</option> </select></td>"; echo "<td>Order By<br><select name = 'order'> <option value = '0'>Last Updated</option> <option value = '1'>ID</option> <option value = '2'>Name</option> <option value = '3'>Downloads</option> <option value = '4'>Rating</option> <option value = '5'>Points</option> <option value = '6'>Random</option> </select></td>"; echo "<td>Acending?<br><select name = 'dir'><option value = '0'>False</option><option selected value = '1'>True</option></select></td>"; echo "</tr><tr><td rowspan = '4'><input type = 'submit' name = 'search' value = 'search'></td></tr></table></form>"; echo "</p>"; So if the $filetype equals 2 I want the dropdown box to show "Graphic/Spritesheets" by default. BTW Official Files is not actually a type so that's why I chose to give it a small letter o and will work the same way as All Types but run a different function. $fileby is used for the OrderBy field. $filedir is for the Acending field. The other data is for the other parts of the script. If you like you can give advice on the name's default because you may have a better method then what I have in my head. Hi. I have drop down boxes for date and time that work. The year is a problem because I am using variables instead of fixed values. Code: [Select] <select name="Year" style="width:60px"> <option value="2010" >Test <option value="<?=$ThisYear?>" <? if ($Year == "<?=$ThisYear?>"){?> SELECTED <?}?> ><?=$ThisYear?> <option value="<?=$NextYear?>" <? if ($Year == "<?=$NextYear?>"){?> SELECTED <?}?> ><?=$NextYear?> </select> <select name="Hour" style="width:50px"> <option value="10" <? if ($_SESSION["Hour"] == "10"){?> SELECTED <?}?> >10 <option value="11" <? if ($_SESSION["Hour"] == "11"){?> SELECTED <?}?> >11 <option value="12" <? if ($_SESSION["Hour"] == "12"){?> SELECTED <?}?> >12 <option value="13" <? if ($_SESSION["Hour"] == "13"){?> SELECTED <?}?> >13 <option value="14" <? if ($_SESSION["Hour"] == "14"){?> SELECTED <?}?> >14 <option value="15" <? if ($_SESSION["Hour"] == "15"){?> SELECTED <?}?> >15 <option value="16" <? if ($_SESSION["Hour"] == "16"){?> SELECTED <?}?> >16 <option value="17" <? if ($_SESSION["Hour"] == "17"){?> SELECTED <?}?> >17 <option value="18" <? if ($_SESSION["Hour"] == "18"){?> SELECTED <?}?> >18 <option value="19" <? if ($_SESSION["Hour"] == "19"){?> SELECTED <?}?> >19 <option value="20" <? if ($_SESSION["Hour"] == "20"){?> SELECTED <?}?> >20 </select> however this works Code: [Select] <select name="Year" style="width:60px"> <option value="2010" >Test <option value="<?=$ThisYear?>" <? if ($Year == "2011"){?> SELECTED <?}?> ><?=$ThisYear?> <option value="<?=$NextYear?>" <? if ($Year == "2012"){?> SELECTED <?}?> ><?=$NextYear?> </select> Can anyone help with this please TIA Desmond. How to define default folder. For example I have folder images and in that folder specific image. In the root directory I have index.php with Code: [Select] <?php require_once("public/includes/header.php"); ?>and in index.php there are links which goes to different folder: Code: [Select] <a href="public/sajt/kategorija.php?id=<?php echo $id; ?>">which also have header.php, but there is no image. How to make default folder for image, or some similar solution? How do I set the date format so that it's always going by the UTC date? I've used: Code: [Select] date_default_timezone_set('UTC'); but, when I change my date on my computer, the date changes on the website. This is really confusing me, googled different ways for like 10/20 minutes and can't find anything. If anyone can help it'd be great, Thanks, Andy. Hi, I am trying to get the date and time that a particular table was last updated, which the code below does, but it doesn't seem to be putting it in the correct timezone, it is 5 hours behind, anyone know why this is? or how i can fix it? Thanks Code: [Select] <?php date_default_timezone_set('Europe/London'); $query = "SELECT UPDATE_TIME FROM information_schema.tables WHERE TABLE_SCHEMA = 'tffdb' AND TABLE_NAME = 'test_team_points'"; $result = mysql_query($query) or die(mysql_error()); $row = mysql_fetch_assoc($result); echo $row['UPDATE_TIME']; ?> Hi guys and gals , got a minor problem. I have a table in which i want the "photo" column to have a default value of "noimage.jpg". I set the default value to "noimage.jpg" and put "as defined" too. but when i fill the form in and leave the upload field blank it doesnt show the noimage.jpg as it should and in the mysql table it leaves it blank and not with default value. Here is the inserts.php which adds the data to the mysql table. Can you help please. <CENTER><B>Vehicle Added</B></CENTER> <BR> <?php mysql_connect("localhost", "wormste1_barry", "barry") or die(mysql_error()); mysql_select_db("wormste1_barry") or die(mysql_error()); $CarName = mysql_real_escape_string(trim($_POST['CarName'])); $CarTitle = mysql_real_escape_string(trim($_POST['CarTitle'])); $CarPrice = mysql_real_escape_string(trim($_POST['CarPrice'])); $CarMiles = mysql_real_escape_string(trim($_POST['CarMiles'])); $CarDescription = mysql_real_escape_string(trim($_POST['CarDescription'])); $pic = mysql_real_escape_string(trim($_FILES['uploadedfile']['name'])); $target_path = "images/"; $target_path = $target_path . basename( $_FILES['uploadedfile']['name']); if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) { echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded"; echo "<br />"; } else{ echo "There was an error uploading the file, please try again!"; } mysql_query("INSERT INTO cars (CarName, CarTitle, CarPrice, CarMiles, CarDescription, photo) VALUES('$CarName', '$CarTitle', '$CarPrice', '$CarMiles', '$CarDescription', '$pic' ) ") or die(mysql_error()); echo "The vehicle data has been added!"; ?> I am loading a link with ajax. When the link pops on the screen and I click it, I get redirected to my 404 page and my lightbox doesn't load. If the link pops in and I refresh my browser, then I click the link my lightbox will show up. How can I do a prevent default on the <a href> in pure JS? No frameworks please. I am using this php code <?php echo $_GET['CiFrame']; ?> to check the url for the variable CiFrame, this allows me to link to a page through my page containing the iframe. Here is my iframe code. <iframe name="CiFrame" width="727" height="805" src="<?php echo $_GET['CiFrame']; ?>" scrolling="auto" frameborder="0"></iframe> The problem is that if the url does not contain a variable the iframe will not open a page. How can i set a default variable if one is not provided? Thank You |
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