Format text into a SEO Friendly String
Posted on August 28, 2008, under PHP, 
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Hi,
This function takes a regular phrase and formats it into a seo friendly string which can be part of an URL.
<?php
function friendly_seo_string($string, $separator = '-')
{
$string = trim($string);
$string = strtolower($string); // convert to lowercase text
// Recommendation URL: http://www.webcheatsheet.com/php/regular_expressions.php
// Only space, letters, numbers and underscore are allowed
$string = trim(ereg_replace("[^ A-Za-z0-9_]", " ", $string));
/*
"t" (ASCII 9 (0x09)), a tab.
"n" (ASCII 10 (0x0A)), a new line (line feed).
"r" (ASCII 13 (0x0D)), a carriage return.
*/
$string = ereg_replace("[ tnr]+", "-", $string);
$string = str_replace(" ", $separator, $string);
$string = ereg_replace("[ -]+", "-", $string);
return $string;
}
$str = friendly_seo_string('Lorem Ipsum is simply dummy text.');
// Outputs: lorem-ipsum-is-simply-dummy-text
echo $str;
?>
This string can be added to a friendly URL like this:
http://www.yourdomain.com/info/lorem-ipsum-is-simply-dummy-text.html
Recommendation URLs:
http://www.webcheatsheet.com/php/regular_expressions.php
http://www.php.net/manual/function.ereg-replace.php
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- August 28, 2008
- article by Gabriel C.
- 2 comments
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2 Replies to "Format text into a SEO Friendly String"
August 29, 2008 at 1:09 PM
[...] many parameters in an URL can create problems in crawling for a Search Engine. A friendly optimised URL would always be a better alternative if this option is available to you. These URLs [...]
March 18, 2011 at 2:17 AM
Function ereg_replace() is deprecated
http://php.net/manual/en/function.ereg-replace.php
You would need to update the method to use the preg_replace().
function friendly_seo_string($string, $separator = ‘-’){ $string = trim($string); // convert to lowercase text $string = strtolower($string); // Only space, letters, numbers and underscore are allowed $string = trim(preg_replace(“{[^ A-Za-z0-9_]}”, ” “, $string)); /* “t” (ASCII 9 (0×09)), a tab. * “n” (ASCII 10 (0x0A)), a new line (line feed). * “r” (ASCII 13 (0x0D)), a carriage return. */ $string = preg_replace(“{[ tnr]+}”, “-”, $string); $string = str_replace(” “, $separator, $string); $string = preg_replace(“{[ -]+}”, “-”, $string); return $string;}