I'm trying to print an xml feed into my php page,but this code is not working correctly, and i have no idea why. It just shows the code as it is on the browser from xpath to ?> . Can anyone help me with this please
<html>
<head>
<title>XML FEED</title>
</head>
<body>
<ul>
<?php
$dom = simplexml_load_file("http://feeds.bbci.co.uk/news/rss.xml");
foreach ($dom->xpath("/channel/item") as $item)
{
print "<li>";
print $item->title;
print "</li>";
}
?>
</ul>
</body>
</html>
Consider adjusting your XPath with double forward slashes as channel is not the root element:
foreach ($dom->xpath("//channel/item") as $item) {
...
}
Alternatively, use the root, rss, element in expression:
foreach ($dom->xpath("/rss/channel/item") as $item) {
...
}
I suspect your server is not configured to allow the short PHP tags (which is discouraged anyway) so Always use the full opening tag.
Since PHP is not parsing your code, the browse gets sent the following...
<? . . . . . foreach ($dom->
Which is not valid HTML, so it is not displayed, but if you view the source of your page, you will see more of your PHP code.
Simply starting your code with <?php will trigger PHP parsing, and things should work.
Related
I want to conditionally output HTML to generate a page, so what's the easiest way to echo multiline snippets of HTML in PHP 4+? Would I need to use a template framework like Smarty?
echo '<html>', "\n"; // I'm sure there's a better way!
echo '<head>', "\n";
echo '</head>', "\n";
echo '<body>', "\n";
echo '</body>', "\n";
echo '</html>', "\n";
There are a few ways to echo HTML in PHP.
1. In between PHP tags
<?php if(condition){ ?>
<!-- HTML here -->
<?php } ?>
2. In an echo
if(condition){
echo "HTML here";
}
With echos, if you wish to use double quotes in your HTML you must use single quote echos like so:
echo '<input type="text">';
Or you can escape them like so:
echo "<input type=\"text\">";
3. Heredocs
4. Nowdocs (as of PHP 5.3.0)
Template engines are used for using PHP in documents that contain mostly HTML. In fact, PHP's original purpose was to be a templating language. That's why with PHP you can use things like short tags to echo variables (e.g. <?=$someVariable?>).
There are other template engines (such as Smarty, Twig, etc.) that make the syntax even more concise (e.g. {{someVariable}}).
The primary benefit of using a template engine is keeping the design (presentation logic) separate from the coding (business logic). It also makes the code cleaner and easier to maintain in the long run.
If you have any more questions feel free to leave a comment.
Further reading is available on these things in the PHP documentation.
NOTE: PHP short tags <? and ?> are discouraged because they are only available if enabled with short_open_tag php.ini configuration file directive, or if PHP was configured with the --enable-short-tags option. They are available, regardless of settings from 5.4 onwards.
Try it like this (heredoc syntax):
$variable = <<<XYZ
<html>
<body>
</body>
</html>
XYZ;
echo $variable;
You could use the alternative syntax alternative syntax for control structures and break out of PHP:
<?php if ($something): ?>
<some /> <tags /> <etc />
<?=$shortButControversialWayOfPrintingAVariable ?>
<?php /* A comment not visible in the HTML, but it is a bit of a pain to write */ ?>
<?php else: ?>
<!-- else -->
<?php endif; ?>
Basically you can put HTML anywhere outside of PHP tags. It's also very beneficial to do all your necessary data processing before displaying any data, in order to separate logic and presentation.
The data display itself could be at the bottom of the same PHP file or you could include a separate PHP file consisting of mostly HTML.
I prefer this compact style:
<?php
/* do your processing here */
?>
<html>
<head>
<title><?=$title?></title>
</head>
<body>
<?php foreach ( $something as $item ) : ?>
<p><?=$item?></p>
<?php endforeach; ?>
</body>
</html>
Note: you may need to use <?php echo $var; ?> instead of <?=$var?> depending on your PHP setup.
I am partial to this style:
<html>
<head>
<% if (X)
{
%> <title>Definitely X</title>
<% }
else
{
%> <title>Totally not X</title>
<% }
%> </head>
</html>
I do use ASP-style tags, yes. The blending of PHP and HTML looks super-readable to my eyes. The trick is in getting the <% and %> markers just right.
Another approach is put the HTML in a separate file and mark the area to change with a placeholder [[content]] in this case. (You can also use sprintf instead of the str_replace.)
$page = 'Hello, World!';
$content = file_get_contents('html/welcome.html');
$pagecontent = str_replace('[[content]]', $content, $page);
echo($pagecontent);
Alternatively, you can just output all the PHP stuff to the screen captured in a buffer, write the HTML, and put the PHP output back into the page.
It might seem strange to write the PHP out, catch it, and then write it again, but it does mean that you can do all kinds of formatting stuff (heredoc, etc.), and test it outputs correctly without the hassle of the page template getting in the way. (The Joomla CMS does it this way, BTW.)
I.e.:
<?php
ob_start();
echo('Hello, World!');
$php_output = ob_get_contents();
ob_end_clean();
?>
<h1>My Template page says</h1>
<?php
echo($php_output);
?>
<hr>
Template footer
$enter_string = '<textarea style="color:#FF0000;" name="message">EXAMPLE</textarea>';
echo('Echo as HTML' . htmlspecialchars((string)$enter_string));
Simply use the print function to echo text in the PHP file as follows:
<?php
print('
<div class="wrap">
<span class="textClass">TESTING</span>
</div>
')
?>
In addition to Chris B's answer, if you need to use echo anyway, still want to keep it simple and structured and don't want to spam the code with <?php stuff; ?>'s, you can use the syntax below.
For example you want to display the images of a gallery:
foreach($images as $image)
{
echo
'<li>',
'<a href="', site_url(), 'images/', $image['name'], '">',
'<img ',
'class="image" ',
'title="', $image['title'], '" ',
'src="', site_url(), 'images/thumbs/', $image['filename'], '" ',
'alt="', $image['description'], '"',
'>',
'</a>',
'</li>';
}
Echo takes multiple parameters so with good indenting it looks pretty good. Also using echo with parameters is more effective than concatenating.
echo '
<html>
<body>
</body>
</html>
';
or
echo "<html>\n<body>\n</body>\n</html>\n";
Try this:
<?php
echo <<<HTML
Your HTML tags here
HTML;
?>
This is how I do it:
<?php if($contition == true){ ?>
<input type="text" value="<?php echo $value_stored_in_php_variable; ?>" />
<?php }else{ ?>
<p>No input here </p>
<?php } ?>
Don't echo out HTML.
If you want to use
<?php echo "<h1> $title; </h1>"; ?>
you should be doing this:
<h1><?= $title;?></h1>
Here's the problem, I am trying to echo a statement or an array after dynamically generated HTML, and unfortunately the thing that i want to echo goes above the HTML, is there any way to echo it after that dynamic HTML or work around?
Code:
Link 1
Link 2
if(isset($_GET["id"]) && $_GET["id"] == "do_something") {
$html = "dynamic html generate";
echo $html;
//after this im using foreach
foreach($array as $item) { echo $item . "<br />"; }
}
As I click one of these two , dynamically generated HTML shows up. Now for example I have an array:
$array = array("error1", "error2");
All the generated PHP goes above the dynamic HTML :/.
How should i fix it so that i can echo all of this array below the dynamic HTML?
Thanks
Use buffering with ob_start
ob_start();
// dynamic html code generate
$dynamic_html = ob_get_clean();
echo $dynamic_html;
// your code
echo $dynamic_html;
Sounds like you missed some closing tags (most likely </table>) in the dynamic html. Thats why the later generated echo gets displayed at the top.
Example (Note the missing closing table):
<?php
echo "<table><tr><td>TableText</td></tr>";
echo "I should be bellow the table, but going to the top.";
?>
will produce:
I should be bellow the table, but going to the top.
TableText
I am using SimplePie RSS to aggregate 4 feeds and they are being sorted by the date (descending) and in the code it is set to echo out the pubDate but it is not showing it. It just prints a blank element.
For sanaties sake (as the code file is tens of lines long I have it in a *.txt file on my server which can be found here: http://feeds.powercastmedia.net/feeds.php.txt
I am completely lost.
Cheers!,
Phill
Try placing other information in the echo calls to ensure that those lines are actually being called, and that the output is being displayed in the expected manor -
<title><? echo "Title: ".$item->get_title(); ?></title>
<link><? echo "Permalink: ".$item->get_permalink(); ?></link>
<pubDate><? echo "PubDate: ".$item->get_date(); ?></pubDate>
<description><? echo "Description: ".$item->get_description(); ?></description>
This kind of "debug output" can help with debugging all sorts of things. It should help you figure out exactly where the problem is originating from.
Also, I noticed that you have numerous unnecessary PHP opening and closing tags, where multiple lines could be consolidated into a single, cleaner code block (Ex:)
<?php if ($success): ?>
<? $itemlimit=0; ?>
<?php foreach($feed->get_items() as $item): ?>
<? if ($itemlimit==10) { break; } ?>
Could be cleaned up to be:
<?php
if($success)
{
$itemlimit = 0;
$items = $feed->get_items(); // This might also help, as PHP sometimes has issues when iterating through arrays returned directly from functions
foreach($items as $item)
{
if($itemlimit == 0) break;
...
In fact, most of the file could be within one pair of PHP tags.
Just a suggestion.
This is my code:
<?php
include("includes/simple_html_dom.php") ;
$url_to_get = "http://getconfused.net/" ;
$homePage = file_get_html($url_to_get);
$allLinks = $homePage->find('a');
foreach ( $allLinks as $link)
{
$href = $link->innertext ;
echo $href . "</br>" ;
}
?>
Simple. Just fetch a page, find any links and print the innertext(<a >innertext</a>) . But for some reason simple html dom here is skipping a lot of links. TO be specific, its missing all the links from the first div (<div id="getconfused">) of the page.
Why ? what can one do to remedy the problem?
Is that div in the body? And is the page otherwise valid?
Probably the html is corrupt in that part, causing the div to be skipped.
I want to conditionally output HTML to generate a page, so what's the easiest way to echo multiline snippets of HTML in PHP 4+? Would I need to use a template framework like Smarty?
echo '<html>', "\n"; // I'm sure there's a better way!
echo '<head>', "\n";
echo '</head>', "\n";
echo '<body>', "\n";
echo '</body>', "\n";
echo '</html>', "\n";
There are a few ways to echo HTML in PHP.
1. In between PHP tags
<?php if(condition){ ?>
<!-- HTML here -->
<?php } ?>
2. In an echo
if(condition){
echo "HTML here";
}
With echos, if you wish to use double quotes in your HTML you must use single quote echos like so:
echo '<input type="text">';
Or you can escape them like so:
echo "<input type=\"text\">";
3. Heredocs
4. Nowdocs (as of PHP 5.3.0)
Template engines are used for using PHP in documents that contain mostly HTML. In fact, PHP's original purpose was to be a templating language. That's why with PHP you can use things like short tags to echo variables (e.g. <?=$someVariable?>).
There are other template engines (such as Smarty, Twig, etc.) that make the syntax even more concise (e.g. {{someVariable}}).
The primary benefit of using a template engine is keeping the design (presentation logic) separate from the coding (business logic). It also makes the code cleaner and easier to maintain in the long run.
If you have any more questions feel free to leave a comment.
Further reading is available on these things in the PHP documentation.
NOTE: PHP short tags <? and ?> are discouraged because they are only available if enabled with short_open_tag php.ini configuration file directive, or if PHP was configured with the --enable-short-tags option. They are available, regardless of settings from 5.4 onwards.
Try it like this (heredoc syntax):
$variable = <<<XYZ
<html>
<body>
</body>
</html>
XYZ;
echo $variable;
You could use the alternative syntax alternative syntax for control structures and break out of PHP:
<?php if ($something): ?>
<some /> <tags /> <etc />
<?=$shortButControversialWayOfPrintingAVariable ?>
<?php /* A comment not visible in the HTML, but it is a bit of a pain to write */ ?>
<?php else: ?>
<!-- else -->
<?php endif; ?>
Basically you can put HTML anywhere outside of PHP tags. It's also very beneficial to do all your necessary data processing before displaying any data, in order to separate logic and presentation.
The data display itself could be at the bottom of the same PHP file or you could include a separate PHP file consisting of mostly HTML.
I prefer this compact style:
<?php
/* do your processing here */
?>
<html>
<head>
<title><?=$title?></title>
</head>
<body>
<?php foreach ( $something as $item ) : ?>
<p><?=$item?></p>
<?php endforeach; ?>
</body>
</html>
Note: you may need to use <?php echo $var; ?> instead of <?=$var?> depending on your PHP setup.
I am partial to this style:
<html>
<head>
<% if (X)
{
%> <title>Definitely X</title>
<% }
else
{
%> <title>Totally not X</title>
<% }
%> </head>
</html>
I do use ASP-style tags, yes. The blending of PHP and HTML looks super-readable to my eyes. The trick is in getting the <% and %> markers just right.
Another approach is put the HTML in a separate file and mark the area to change with a placeholder [[content]] in this case. (You can also use sprintf instead of the str_replace.)
$page = 'Hello, World!';
$content = file_get_contents('html/welcome.html');
$pagecontent = str_replace('[[content]]', $content, $page);
echo($pagecontent);
Alternatively, you can just output all the PHP stuff to the screen captured in a buffer, write the HTML, and put the PHP output back into the page.
It might seem strange to write the PHP out, catch it, and then write it again, but it does mean that you can do all kinds of formatting stuff (heredoc, etc.), and test it outputs correctly without the hassle of the page template getting in the way. (The Joomla CMS does it this way, BTW.)
I.e.:
<?php
ob_start();
echo('Hello, World!');
$php_output = ob_get_contents();
ob_end_clean();
?>
<h1>My Template page says</h1>
<?php
echo($php_output);
?>
<hr>
Template footer
$enter_string = '<textarea style="color:#FF0000;" name="message">EXAMPLE</textarea>';
echo('Echo as HTML' . htmlspecialchars((string)$enter_string));
Simply use the print function to echo text in the PHP file as follows:
<?php
print('
<div class="wrap">
<span class="textClass">TESTING</span>
</div>
')
?>
In addition to Chris B's answer, if you need to use echo anyway, still want to keep it simple and structured and don't want to spam the code with <?php stuff; ?>'s, you can use the syntax below.
For example you want to display the images of a gallery:
foreach($images as $image)
{
echo
'<li>',
'<a href="', site_url(), 'images/', $image['name'], '">',
'<img ',
'class="image" ',
'title="', $image['title'], '" ',
'src="', site_url(), 'images/thumbs/', $image['filename'], '" ',
'alt="', $image['description'], '"',
'>',
'</a>',
'</li>';
}
Echo takes multiple parameters so with good indenting it looks pretty good. Also using echo with parameters is more effective than concatenating.
echo '
<html>
<body>
</body>
</html>
';
or
echo "<html>\n<body>\n</body>\n</html>\n";
Try this:
<?php
echo <<<HTML
Your HTML tags here
HTML;
?>
This is how I do it:
<?php if($contition == true){ ?>
<input type="text" value="<?php echo $value_stored_in_php_variable; ?>" />
<?php }else{ ?>
<p>No input here </p>
<?php } ?>
Don't echo out HTML.
If you want to use
<?php echo "<h1> $title; </h1>"; ?>
you should be doing this:
<h1><?= $title;?></h1>