In PHP we echo strings this way :
echo 'string';
But i saw PHP frameworks like Laravel and scripts echo strings using Curly Brackets :
{string}
How i can do that without using any PHP framework?
It's not necessary to use Curly Brackets if there is other way to short echo!
I prefer code examples.
PHP has a few methods to print strings, such as (but not limited to) print, and echo or just shorthand <?= "str" ?>.
The bracket print that you ask about from laravel is not per say in php.
That is from a template engine called Blade.
So the {} way of printing stuff is not possible in php.
You will have to stick to the standard ways or use a template engine!
You can short echo by
<?= $variable; ?> when you open a new php tag
or you use, as described in your question a framework such as laravel - that's pretty much it
What you can do, but I'm not really sure if it's a good idea - write a function like:
function x($string) {
echo $string;
}
x('Test'); // will output Test
The short answer is you can't do that with PHP. PHP provides language constructs to output to standard output, etc. PHP doesn't provide a pre-processor. Most template frameworks are a pre-processor meaning that they convert your {<STRING>} into an echo $x statement.
So either create your own template framework, or stick to PHP's API.
After researching i found a Template Engine called Smarty that allows me to echo using Curly Brackets
First i created 2 files index.php , template.html
Then i moved the folder /libs that i downloaded from the template page to my script directory
and in my index.php i required the Smarty.class file
require_once "libs/Smarty.class.php";
then i called the Smarty class :
$smarty = new Smarty;
after that i pushed the variable :
$smarty ->assign("name",'Amr');
and i displayed the template file index.html
$smarty ->display("template.html");
at the end i wrote in the index.html <p>{$name}</p> and it outputted : Amr
Related
I am trying to pass specific variables to the html file which has extension of .php
for e.g I am trying to load main.php by using loadHTMLFile() function in another file. but when I try to add code like this
"<?php echo "hello world"?>"
and running the website and checking it's inspect elemnt this php code is commented, do you have any idea or way around of this?
I have tried using semicolon like this
'.<?php echo "hello world" ?>.'
also
'.echo "hello world".'
but it does not works
function loadHtml($loadfile){
libxml_use_internal_errors(true);
$doc = new DOMDocument();
$doc->loadHTMLFile($loadfile);
echo $doc->saveHtml() ;
}
and is called in index.php like this:
loadHtml("./views/html/shop/main.php");
about errors there are no errors just that I can't call the php variable or function or anythin php related to the main.php file because anything that has php tags around it is commented. Please help me if you know solution or way around this.
You can use file_get_contents() with eval()
Example: eval(file_get_contents('file.php'));
But you will either have to remove the PHP tags from the file you want to include or do like this: eval('?>'. file_get_contents('file.php'));
Why you didn't use just require("./views/html/shop/main.php") or include("./views/html/shop/main.php")?
Using eval() is not great idea, because it call script in special context, and is it unsafe, less effective to power and little hard to debug errors in future (stack trace log is not contain source of eval files).
I am building a website using php. I would want to separate the php from the html. Smarty engine, I guess does that, but right now its too complicated for me. Looking for a quick fix and easy to learn solution, one which is an accepted standard as well. Anyone helping please.
Consider frameworks or choose a template engine
Use a framework. Depending on your project, either a micro framework like Slim or something more complete like Laravel.
What I sometimes do when writing complex systems with quite much php code is separating it the following way (don't know your exact project, but it might work for you):
You create a php file with all the functions and variables you need. Then, you load every wepgage through the index.php file using .htaccess (so that a user actually always loads the index.php with a query string). Now, you can load the html page using file_get_contents (or similar) into a variable (I call this $body now); this variable can be modified using preg_replace.
An example: In the html file, you write {title} instead of <title>Sometext</title>
The replacement replaces {title} with the code you actually need:
$body = str_replace('{title}', $title, $body);
When all replacements are done, simply echo $body...
Just declare a lot of variables and use them in the template:
In your application:
function renderUserInformation($user)
{
$userName = $user->userName;
$userFullName = $user->fullName;
$userAge = $user->age;
include 'user.tpl.php';
}
In user.tpl.php:
User name: <?=$username?><br>
Full name: <?=userFullName?><br>
Age: <?=$userAge?>
By putting it in a function, you can limit the scope of the variables, so you won't pollute your global scope and/or accidentally overwrite existing variables.
This way, you can just 'prepare' the information needed to display and in a separate php file, all you need to do is output those variables.
Of course, if you must, you can still add more complex PHP code to the template, but try to do it as little as possible.
In the future, you might move this 'render' function to a separate class. In a way, this class is a view (a User View, in this case), and it is one step in creating a MVC structure. (But don't worry about that for now.)
Looking for a quick fix and easy to learn solution
METHOD 1 (the laziest; yet you preserve highlighting on editors like notepad++)
<?php
// my php
echo "foo";
$a = 4;
// now close the php tag -temporary-
// to render some html in the laziest of ways
?>
<!-- my html -->
<div></div>
<?php
// continue my php code
METHOD 2 (more organized; use template files, after you passed some values on it)
<?php
// my php
$var1 = "foo";
$title = "bar";
$v = array("var1"=>"foo","title"=>"bar"); // preferrable
include("template.php");
?>
template.php
<?php
// $var1, $var2 are known, also the array.
?>
<div>
<span> <?php echo $v["title"]; ?> </span>
</div>
Personally, i prefer method 2 and im using it in my own CMS which uses lots and lots of templates and arrays of data.
Another solution is of course advanced template engines like Smarty, PHPTemplate and the likes. You need a lot of time to learn them though and personally i dont like their approach (new language style)
function renderUserInformation($user)
{
$userName = $user->userName;
$userFullName = $user->fullName;
$userAge = $user->age;
include 'user.tpl.php';
}
I've seen several scripts during my time as a web programmer (I'm still new though) which had PHP included in an uncommon way.
The PHP was not added the usual way like <div><?php echo $foo; ?></div>, but this way: <div>{FOO}</div> or this <div>{$foo}</div>.
I am wondering how I could achieve such a thing? I really want to learn this thing.
Can someone direct me to the correct sources to learn this?
Thanks.
It has to be a template engine? You inject values to it from a PHP script. Smarty is a basic example.
For example, from your PHP page, you write :
include('Smarty.class.php');
$smarty = new Smarty;
$smarty->assign('foo', 'Bar Baz');
$smarty->display('index.tpl');
And, your template page would look like
<div>{foo}</div>
with .tpl extenstion.
When the program is run, the template variable {foo} will be replaced by its assigned value "Bar Baz"
The Developer must have been using a Template Engine Such as Smarty
You can even define arrays:
{assign var=foo value=[1,2,3]}
Objects
{$foo->bar}
The following would help you get started
http://www.9lessons.info/2011/09/smarty-template-engine-using-php.html
http://www.dreamincode.net/forums/topic/255552-an-introduction-to-smarty-php-template-engine/
http://www.moskalyuk.com/blog/smarty-faq
http://www.youtube.com/watch?v=5xLfvY8upsQ (Video)
I've experienced first hand the extent of the horror and foot-shooting that the ugliness of PHP can cause. I'm onto my next project (you may be wondering why I'm not just switching languages but that's not why I'm here) and I've decided to try doing it right, or at least better, this time.
I've got some models defined, and I've started on a main controller. I'm at a fork in my decisions about how to implement the view. So far, the main controller can be given lists of display functions to call, and then it can spew out the whole page with one call. It looks like:
function Parse_Body()
{
foreach ($this->body_calls as $command)
{
$call = $command['call'];
if (isset($command['args'])) $call($command['args']);
else $call();
}
}
My dilemma is this:
Would it be better to have all of my display functions return the HTML they generate, so that the main controller can just echo $page; or should the display files use raw HTML outside of PHP, which gets output as soon as it's read?
With the former, the main app controller can precisely control when things get output, without just relinquishing complete control to the whim of the displays. Not to mention, all those lists of display functions to call (above) can't really be executed from a display file unless they got passed along. With the latter method, I get the benefit of doing HTML in actual HTML, instead of doing huge PHP string blocks. Plus I can just include the file to run it, instead of calling a function. So I guess with that method, a file is like a function.
Any input or advice please?
Would it be better to have all of my
display functions return the HTML they
generate, so that the main controller
can just echo $page; or should the
display files use raw HTML outside of
PHP, which gets output as soon as it's
read?
One of the advantages of php is that the processing is similar to the output:
So:
<h1> <?= $myHeading; ?> </h1>
Is more clear than:
echo "<h1>$myHeading</h1>";
An even more than:
echo heading1($myHeading); //heading1() being an hypothethical user defined function.
Based on that I consider that it is better to in the view to have HTML and and just print the appropriate dynamic fields using php.
In order to get finner control over the output you can use: ob_start as gurunu recommended.
You could of course use any of the several php MVC frameworks out there.
My prefered one, now is: Solarphp
but Zend Framework and Cakephp could help you too.
And finally if you don't want to use any framework
You could still use a pretty slim templating engine: phpSavant.
That will save you a few headaches in the development of your view.
th
You can get the benefit of both, obtaining a string of HTML while also embedding HTML within PHP code, by using the output control functions:
From the PHP manual # http://www.php.net/manual/en/ref.outcontrol.php:
<?php
function callback($buffer)
{
// replace all the apples with oranges
return (str_replace("apples", "oranges", $buffer));
}
ob_start("callback");
?>
<html>
<body>
<p>It's like comparing apples to oranges.</p>
</body>
</html>
<?php
ob_end_flush();
?>
First buffer everything. then replace tags using a parser at end of script.
<?php
$page_buffer = '';
function p($s){
global $page_buffer;
$page_buffer .= $s;
}
$page_buffer = str_replace(
array('<$content$>','<$title$>'),
array($pagecontent,$pagetitle),
$page_buffer);
echo $page_buffer;
?>
Samstyle PHP Framework implements output buffering and View model this way
And did I mention about benefits of buffering your output in a variable before "echo-ing"? http://thephpcode.blogspot.com/2009/02/php-output-buffering.html
I want to define something like this in php:
$EL = "\n<br />\n";
and then use that variable as an "endline" marker all over my site, like this:
echo "Blah blah blah{$EL}";
How do I define $EL once (in only 1 file), include it on every page on my site, and not have to reference it using the (strangely backwards) global $EL; statement in every page function?
Most PHP sites should have a file (I call it a header) that you include on every single page of the site. If you put that first line of code in the header file, then include it like this on every page:
include 'header.php';
you won't have to use the global keyword or anything, the second line of code you wrote should work.
Edit: Oh sorry, that won't work inside functions... now I see your problem.
Edit #2: Ok, take my original advice with the header, but use a define() rather than a variable. Those work inside functions after being included.
Sounds like the job of a constant. See the function define().
Do this
define ('el','\n\<\br/>\n');
save it as el.php
then you can include any files you want to use, i.e
echo 'something'.el; // note I just add el at end of line or in front
Hope this help
NOTE please remove the '\' after < br since I had to put it in or it wont show br tag on the answer...
Are you using PHP5? If you define the __autoload() function and use a class with some constants, you can call them where you need them. The only aggravating thing about this is that you have to type something a little longer, like
MyClass::MY_CONST
The benefit is that if you ever decide to change the way that you handle new lines, you only have to change it in one place.
Of course, a possible negative is that you're calling including an extra function (__autoload()), running that function (when you reference the class), which then loads another file (your class file). That might be more overhead than it's worth.
If I may offer a suggestion, it would be avoiding this sort of echoing that requires echoing tags (like <br />). If you could set up something a little more template-esque, you could handle the nl's without having to explicitly type them. So instead of
echo "Blah Blah Blah\n<br />\n";
try:
<?php
if($condition) {
?>
<p>Blah blah blah
<br />
</p>
<?php
}
?>
It just seems to me like calling up classes or including variables within functions as well as out is a lot of work that doesn't need to be done, and, if at all possible, those sorts of situations are best avoided.
#svec yes this will, you just have to include the file inside the function also. This is how most of my software works.
function myFunc()
{
require 'config.php';
//Variables from config are available now.
}
Another option is to use an object with public static properties. I used to use $GLOBALS but most editors don't auto complete $GLOBALS. Also, un-instantiated classes are available everywhere (because you can instatiate everywhere without telling PHP you are going to use the class). Example:
<?php
class SITE {
public static $el;
}
SITE::$el = "\n<br />\n";
function Test() {
echo SITE::$el;
}
Test();
?>
This will output <br />
This is also easier to deal with than costants as you can put any type of value within the property (array, string, int, etc) whereas constants cannot contain arrays.
This was suggested to my by a user on the PhpEd forums.
svec, use a PHP framework. Just any - there's plenty of them out there.
This is the right way to do it. With framework you have single entry
point for your application, so defining site-wide variables is easy and
natural. Also you don't need to care about including header files nor
checking if user is logged in on every page - decent framework will do
it for you.
See:
Zend framework
CakePHP
Symfony
Kohana
Invest some time in learning one of them and it will pay back very soon.
You can use the auto_prepend_file directive to pre parse a file. Add the directive to your configuration, and point it to a file in your include path. In that file add your constants, global variables, functions or whatever you like.
So if your prepend file contains:
<?php
define('FOO', 'badger');
In another Php file you could access the constant:
echo 'this is my '. FOO;
You might consider using a framework to achieve this. Better still you can use
Include 'functions.php';
require('functions');
Doing OOP is another alternative
IIRC a common solution is a plain file that contains your declarations, that you include in every source file, something like 'constants.inc.php'. There you can define a bunch of application-wide variables that are then imported in every file.
Still, you have to provide the include directive in every single source file you use. I even saw some projects using this technique to provide localizations for several languages. I'd prefer the gettext way, but maybe this variant is easier to work with for the average user.
edit For your problem I recomment the use of $GLOBALS[], see Example #2 for details.
If that's still not applicable, I'd try to digg down PHP5 objects and create a static Singleton that provides needed static constants (http://www.developer.com/lang/php/article.php/3345121)
Sessions are going to be your best bet, if the data is user specific, else just use a conifg file.
config.php:
<?php
$EL = "\n<br />\n";
?>
Then on each page add
require 'config.php'
the you will be able to access $EL on that page.