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Just a slug generator. I'm wondering if this can be simplified any further.

Many thanks.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"

Updated version based on feedback:

<?php
function createSlug($string) {
 
    // Replace all non letters, numbers, spaces or hypens
    $lettersNumbersSpacesHyphens = preg_replace('/[^\-\s\pN\pL]+/u', '', $string);

    // Replace spaces and duplicate hyphens with a single hypen
    $spacesDuplicateHypens = preg_replace('/[\-\s]+/', '-', $lettersNumbersSpacesHyphens);
 
    // Trim off left and right hypens
    $slug = trim($spacesDuplicateHypens, '-');

    return mb_strtolower($slug, 'UTF-8');
}

echo createSlug('-- This is an example ű of an ------ article   - @@@ ..,.%&*£%$&*(*');

Just a slug generator. I'm wondering if this can be simplified any further.

Many thanks.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"

Updated version based on feedback:

<?php
function createSlug($slug) {

    $lettersNumbersSpacesHyphens = '/[^\-\s\pN\pL]+/u';
    $spacesDuplicateHypens = '/[\-\s]+/';

    $slug = preg_replace($lettersNumbersSpacesHyphens, '', $slug);
    $slug = preg_replace($spacesDuplicateHypens, '-', $slug);

    $slug = trim($slug, '-');

    return mb_strtolower($slug, 'UTF-8');
}

echo createSlug('-- This is an example ű of an ------ article   - @@@ ..,.%&*£%$&*(*');
?>

Just a slug generator. I'm wondering if this can be simplified any further.

Many thanks.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"

Just a slug generator. I'm wondering if this can be simplified any further.

Many thanks.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"

Updated version based on feedback:

<?php
function createSlug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $lettersNumbersSpacesHyphens = preg_replace('/[^\-\s\pN\pL]+/u', '', $string);

    // Replace spaces and duplicate hyphens with a single hypen
    $spacesDuplicateHypens = preg_replace('/[\-\s]+/', '-', $lettersNumbersSpacesHyphens);

    // Trim off left and right hypens
    $slug = trim($spacesDuplicateHypens, '-');

    return mb_strtolower($slug, 'UTF-8');
}

echo createSlug('-- This is an example ű of an ------ article   - @@@ ..,.%&*£%$&*(*');

Just a slug generator. I'm wondering if this can be simplified any further.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"

Just a slug generator. I'm wondering if this can be simplified any further.

Many thanks.

<?php
function slug($string) {

    // Replace all non letters, numbers, spaces or hypens
    $string = preg_replace('/[^\-\sa-zA-Z0-9]+/', '', mb_strtolower($string));

    // Replace spaces and duplicate hyphens with a single hypen
    $string = preg_replace('/[\-\s]+/', '-', $string);

    // Trim off left and right hypens
    $string = trim($string, '-');

    return $string;
}

echo slug('-- This is an example     of an ------ article   - @@@ ..,.:~&**%$£%$^*'); // outputs "this-is-an-example-of-an-article"