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It s usually not very user friendly to display a large volume of data on a single HTML page, as doing so forces the user to scroll up and down endlessly to view the results This is where pagination the act of breaking up large data sets into smaller subsets and displaying them one page at a time can help By breaking the large mass of data into smaller, more easily navigable pages, you increase the usability of your application, and you also avoid overwhelming the user with mountains of data at once
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PEAR s Pager class, available from http://pearphpnet/package/Pager, takes all the pain out of paginating large data sets Given an array of values, the Pager class breaks the array into discrete pages of smaller elements and generates navigation links to move back and forth between the pages The previous listing demonstrates the Pager class in action The data set here is a list of all the files in a directory; this list is broken into pages of ten items each, with the Pager class providing the navigation between pages The data set is passed to the Pager object via the $options array This array also sets various paging parameters, such as the number of items per page and the number of pages accessible through the navigation links The getPageDate() method retrieves, as an array, the list of items for the current page, while the getLinks() method generates an array of next page and previous page navigation links, together with a clickable list of page numbers for easy access to any part of the collection Figure 7-7 demonstrates what the output looks like
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Figure 7-7
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A directory listing, broken up into pages
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You want to identify the user s browser type and version number
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Solution
Use PHP s get_browser() function:
< php // get browser information $browser = get_browser(null, true); // result: "Your browser is Firefox 20" (example) print "Your browser is " $browser['browser'] " " $browser['version']; >
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The get_browser() function evaluates the $_SERVER['HTTP_USER_AGENT'] string and returns information about the client currently accessing the script This information includes the client identification string and version number, together with detailed information on the client s capabilities All this information is returned as an associative array, which might look something like Figure 7-8 You can use the information supplied by get_browser() to selectively display code optimized for particular browser types and version numbers Here s an example:
< php if (($browser['browser'] == "Opera" ) && ($browser['version'] >= 6)) { // code for Opera 6x } >
NOTE
In order to use the get_browser() function, you must have configured PHP to point to a valid browscapini file on your system You can obtain a browscapini file from http://wwwgarykeithcom/browsers/downloadsasp, or you can visit the PHP manual page at http://wwwphpnet/get-browser for more information
7: Working with HTML and Web Pages
Figure 7-8
Output of the get_browser() function
An alternative here is to use the phpSniff class, available from http:// phpsniffsourceforgenet/ This class, like the get_browser() function, evaluates the user agent string and returns information on the client s capabilities and type Here s an example of how it can be used:
< php // include phpSniff library include "phpSniffclassphp"; // initialize object $sniffer = new phpSniff($_SERVER['HTTP_USER_AGENT']); // get browser name, version and platform $browser = $sniffer->get_property('browser'); $version = $sniffer->get_property('version'); $platform = $sniffer->get_property('platform'); $os = $sniffer->get_property('os');
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// result: "Your browser is mz 181 running on win xp" (example) print "Your browser is $browser $version running on $platform $os"; >
718 Triggering Browser Downloads
Problem
You want to send the user s browser a file and manually trigger its download mechanism
Solution
Send the browser appropriate Content-Type and Content-Disposition headers, to force it to begin downloading the file:
< php // set the filename $filename = "/tmp/photoszip"; // send headers to client to initiate file download header ("Content-Type: application/octet-stream"); header ("Content-Length: " filesize($filename)); header ("Content-Disposition: attachment; filename=" basename($filename)); // send file to client readfile($filename); >
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