Detailed description of PHP error interface, detailed description of PHP error_PHP tutorial

Detailed description of PHP error interface, detailed description of PHP error

One of the common errors on the web is invalid links. Once invalid links appear from other sites, you will rearrange your
site. People will bookmark a site they like, and if they come back three months later and only find a '404 Not Fount '
, they won't be given the task of telling them how to get out of your site. Go find the original information. Let's fix this, or at least
give your users some friendly help and some trace once they encounter a 'a 404' error. You can create a normal page to
report all errors encountered while processing your page.

PHP together with Apache gives you the freedom to create your own error pages, but it requires reconfiguration and a small amount of
coding. Let's learn the configuration part first.

Apache’s ErrorDocument directive is used to indicate which document (or URI) Apache should redirect to when an error occurs. It allows you to
specify a resource for each error code your users may encounter. By adding an ErrorDocument 404
/error.php directive to your server configuration. This will redirect the user to 'error.php' when they visit a page that does not exist. Below we will write the
'error.php' page. Don't forget to restart Apache for the changes to take effect.

Next, we write a simple error.php:

The file you requested (=$REDIRECT_URL?> ) does not exist on this server.
Please find the file you want from previous page.

Now try to read a page that does not exist on your server. How about, you can see error.php, it has a nice and
friendly message, and there is also a to Link to previous page.

Let’s expand it a bit. As you can see, I'm using the REDIRECT_URL variable in error.php. This variable is set by Apache when
executes an ErrorDocument directive, and gives a possibility to find the original resource. In this case, Apache
also sets some other variables, all of which can be found here. Using these variables it is possible to create a nice error page, giving
users a nice and friendly error page instead of the default page given by Apache.

Outputting errors from a PHP page
Outputting errors from a PHP page is much like simulating what Apache does with the ErrorDocument directive, you simply redirect the user,
by using query-string Variables, while Apache is usually set in environment variables. This way you can use the same error page to
handle various errors. Here is an example:




function throw_error($message) {
$error_page = "/err/error.php";

$error_url = $error_page;
$error_url .= "?REDIRECT_ERROR_NOTES=$message";
$error_url .= "&REDIRECT_URL=" . $GLOBALS["PHP_SELF"];
$ error_url .= "&REDIRECT_REQUEST_METHOD=$REQUEST_METHOD";
$error_url .= "&REDIRECT_STATUS=501";
Header("Status: 501");
Header("Location: $error_url");
exit;
}

ob_start();
// Use output buffering to output errors anywhere in this page

if(!condition) {
throw_error("the condition failed");
}

ob_end_flush();
// After the page is processed, refresh the output buffer
?>
Use the output buffering feature of PHP4 Also useful for generating general error reporting functionality. But when you confirm that the entire error page has been processed
, don’t forget to refresh the buffer. You can redirect through the Header call anywhere in your code.

Detailed description: http://php.662p.com/thread-333-1-1.html

php jump page problem

a.php (registration page)

b.php (processing page, with two jump methods at the end)

The code is here (delete unnecessary and you can test it)
a.php

Name:

Age: Address:

b.php
location...the rest of the text>>

php page usage framework problem

When the parent page is refreshed, every element on the page will be reloaded, including the iframe element on the parent page. Naturally, the embedded page of the iframe will also be reloaded and refreshed, because the src attribute of the iframe will be reloaded. Load once.
In fact, you can use ajax to regularly update some specific information on the parent page. If the iframe of the parent page does not need to be updated, and the src of the iframe remains unchanged, then the child page will not be refreshed.

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