Search engine friendly post slug URLs
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Written by DanielRo
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In this PHP tutorial you are going to learn how the famous post slugs
are created and how you can create your own post-slug function for your
web applications.
By default your publishing system (ie Wordpress) is creating URLs like http://example.com/?p=13. For Search Engine Optimization (SEO) sake one would prefer URLs like http://example.com/hello-world that would dramatically increase your odds of making a lot more sense to search engines (SE).
Here is an actual working example:
Post slug converter
Here's the actual code of the slug converter:
<?
function makeslug($title, $id, $ext=".html") {
$pslug = preg_replace("/[^a-zA-Z0-9 ]/", "", $title);
$pslug = str_replace(" ", "-", $pslug);
$pslug = strtolower($pslug);
$pslug = $id."_".$pslug.$ext;
return $pslug;
}
if(isset($_POST['title']) && isset($_POST['id'])) {
$id = $_POST['id'];
$title = $_POST['title'];
$url = makeslug($title, $id);
echo "From <strong>" .$title. "</strong> our script created <strong>" .$url. "</strong><br /><br />";
echo "<a href=" .$url. ">".$title."</a><br /><br />";
echo "Notice the generated URL of the above link.";
}
else {
?>
<strong>Post slug converter</strong><br />
<form action=<?=$_SERVER['PHP_SELF'];?> method=post name="conv">
<input type="text" name="title" value="Enter title to convert" onfocus="if (this.value == 'Enter title to convert') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Enter title to convert';}" ><br /><br />
<input type="text" name="id" value="Enter ID" onfocus="if (this.value == 'Enter ID') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Enter ID';}" /><br />
<input type=submit name="conv" value="Convert">
</form>
<? } ?>
By reading our PHP Forms and Input form text switch using JavaScript tutorials, you will get a general ideea of the techniques used here.
The new PHP code we are using is the makeslug function. This is a basic user defined php function with two required parameters ($title and $id) and an optional parameter $ext.
By using PHP's preg_replace this function removes any non a-zA-Z0-9 characters from our string. Then by using str_replace, it replaces all white spaces with a dash "-".
Then by using strtolower it converts all of our strings characters to lowercase and then returns our final converted string (post slug, friendlyurl).
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Last Updated ( Monday, 22 October 2007 )
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