Paginate text file with PHP
I have a small script that displays blog posts from a text file, how can I add pagination so that it only shows 5 blog posts at a time?
Here is the script:
<html>
<head>
<title>blog</title>
</head>
<body>
<?php
$mode = 0;
if ($mode == 0) { $opFile = "blogfile.txt"; }
$fp = fopen($opFile,"r") or die("Error Readi开发者_如何学运维ng File");
$data = fread($fp, filesize($opFile));
fclose($fp);
$line = explode("\n", $data);
$i=count($line);
for ($n=0 ; $n < $i-1 ; $n++ ) {
$blog = explode("|", $line[$n]);
if (isset($blog[0]))
{
echo "<div class=\"blog-post\">";
echo "<p class=\"blog-title\">".$blog[1]."</p>";
echo "<p class=\"blog-message\">".$blog[2]."</p>";
echo "<p class=\"blog-date\">Posted: " .$blog[0]."</p>";
echo "<div style=\"clear: both;\"></div>";
echo "</div>";
}
}
?>
</body>
</html>
And here is the text file:
Feb 17 2010|Title|Blog post content here|[end]
Feb 17 2010|Title|Blog post content here|[end]
Feb 17 2010|Title|Blog post content here|[end]
Feb 17 2010|Title|Blog post content here|[end]
Any help is greatly appreciated!
Something like this:
<html>
<head>
<title>blog</title>
</head>
<body>
<?php
$POSTS_PER_PAGE = 10;
//Not sure what this is for, but I left it?
$mode = 0;
if ($mode == 0) { $opFile = "blogfile.txt"; }
//Explode the textfile into lines
$lines = file($opFile);
$posts = array();
foreach($lines as $line) {
//Ignore blank lines
if($line != "") {
//Explode each non-empty line
$post = explode("|", $line);
//Store the blog post
array_push($posts, $post)
}
}
//Output the pagination links
echo "<div class=\"blog-pagination\">";
for($i = 1; $i < ceil(count($posts) / $POSTS_PER_PAGE; $i++) {
echo '<a href="http://mydomain/blog.php?page=' + $i + '">' + $i + '</a> ';
}
echo "</div>";
//Assume the user wants the first page if it's not specified
if(!isset($_GET['page'])) {
$_GET['page'] = 1;
}
//Figure out the first and last posts on this page
$first_post = ($_GET['page'] - 1) * $POSTS_PER_PAGE;
$last_post = $_GET['page'] * $POSTS_PER_PAGE - 1;
//Display the requested posts
for($i = $first_post; $i <= $last_post; $i++) {
echo "<div class=\"blog-post\">";
echo "<p class=\"blog-title\">".$blog[1]."</p>";
echo "<p class=\"blog-message\">".$blog[2]."</p>";
echo "<p class=\"blog-date\">Posted: " .$blog[0]."</p>";
echo "<div style=\"clear: both;\"></div>";
echo "</div>";
}
?>
(This is completely untested, but hopefully you can take it from here!)
This worked in my tests:
define('MAX_PER_PAGE',10);
// sanity checks for per-page and page index
$numPosts = ctype_digit((string)$_GET['perpage']) ? $_GET['perpage'] : 5;
$ostart = $start = max(1, ctype_digit((string)$_GET['page']) ? $_GET['page'] : 1) - 1;
$mode = 0;
if ($mode == 0) {
$file = "blogfile.txt";
}
// read the file into an array, strip newlines and ignore empty lines
file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES | FILE_TEXT);
// sort array (see custom function at bottom)
usort($line, 'blogsort');
$lines = count($line);
// get total number of pages
$numPages = ceil($lines / $numPosts);
// additional sanity checks (also sets $ostart if it was invalid; used later)
$numPosts = min(MAX_PER_PAGE, max(1, $numPosts));
if ($start * $numPosts > $lines ) {
$ostart = $start = max(0, $lines - $numPosts);
}
else {
$start *= $numPosts;
}
// Only grab the part of the array we need
$sliced = array_slice($line, $start, $numPosts);
// loop through posts, but break early if we run out
for ($n = 0; $n < $numPosts && isset($sliced[$n]); $n++ ) {
$blog = explode("|", $sliced[$n]);
if (isset($blog[0])) {
echo "<div class=\"blog-post\">\n",
"<p class=\"blog-title\">{$blog[1]}</p>\n",
"<p class=\"blog-message\">{$blog[2]}</p>\n",
"<p class=\"blog-date\">Posted: {$blog[0]}</p>\n",
"<div style=\"clear: both;\"></div>\n",
"</div>\n\n";
}
}
// back link
if ($ostart > 0) {
echo "<a href=\"{$_SERVER['SCRIPT_NAME']}?perpage={$numPosts}&page={$ostart}\">← Older</a>";
}
else {
echo "None Older";
}
echo " || ";
// forward link
if ($ostart + 1 < $numPages) {
$next = $ostart + 2;
echo "<a href=\"{$_SERVER['SCRIPT_NAME']}?perpage={$numPosts}&page={$next}\">Newer →</a>";
}
else {
echo "None Newer";
}
function blogsort($a, $b) {
$dateA = strtotime(substr($a, 0, strpos($a, '|')));
$dateB = strtotime(substr($b, 0, strpos($b, '|')));
if ($dateA == $dateB) {
return 0;
}
elseif ($dateA > $dateB) {
return -1;
}
else {
return 1;
}
}
加载中,请稍侯......
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