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Creating URL slugs properly in PHP (including transliteration for UTF-8)

The point to use a slug (semantic URL) besides of improve the SEO of your articles is to prevent that the user, at the creation of for example an article, it uses special characters that aren't allowed in a URL, appropiate the usage etc. What target usage means, is context dependent.

In this article, you'll learn how to slugify a string in PHP properly, including (or not) support (conversion) for cyrilic and special latin characters.

Slugify in PHP

The following function exposes a simple way to convert text into a valid slug:

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<?php
/**
 * WARNING! THIS SNIPPET MAY BE OUTDATED.
 * The latest version of this snippet can be found in the Gravity Wiz Snippet Library:
 * https://github.com/gravitywiz/snippet-library/blob/master/gravity-forms/gw-min-and-max-character-limit.php
 */
/**
* Gravity Wiz // Require Minimum Character Limit for Gravity Forms
* 
* Adds support for requiring a minimum number of characters for text-based Gravity Form fields.

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<?php
add_filter('gform_validation_1', 'ip_validation');
	function ip_validation($validation_result){
		$form = $validation_result["form"];
//validate input 9 on form 1 for valid IP
	if($_POST['input_9'] != filter_var($_POST['input_9'], FILTER_VALIDATE_IP)){
		$validation_result["is_valid"] = false;
		foreach($form["fields"] as &$field){
			if($field["id"] == "9"){
				$field["failed_validation"] = true;

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[10-Mar-2018 16:08:01 UTC] 
array (
  //query-monitor/query-monitor.php,
  //hello.php,
);

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<?php
/*
Plugin Name: Multisite Plugins Activate
Plugin URI: http://www.damiencarbery.com
Description: List of active plugins on a Multisite installation.
Author: Damien2
*/


// Based on: http://wordpress.stackexchange.com/a/54782/57684

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Function FixID(InID As String) As String
    
    If Len(InID) = 18 Then
        FixID = InID
        Exit Function
    End If
    
    Dim InChars As String, InI As Integer, InUpper As String
    Dim InCnt As Integer
    

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We couldn’t find that file to show.

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<?php
/**
 * Gravity Wiz // Gravity Forms // Limit Submissions Per Time Period (by IP, User, Role, Form URL, or Field Value)
 *
 * Limit the number of times a form can be submitted per a specific time period. You modify this limit to apply to
 * the visitor's IP address, the user's ID, the user's role, a specific form URL, or the value of a specific field.
 * These "limiters" can be combined to create more complex limitations.
 *
 * @version	3.0
 * @author  David Smith <[email protected]>

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<?php
add_action( 'register_form', 'loginpress_plugin_register_form_custom_field' );
function loginpress_plugin_register_form_custom_field() {

  $first_name = ( ! empty( $_POST['first_name'] ) ) ? trim( $_POST['first_name'] ) : '';
  $last_name  = ( ! empty( $_POST['last_name'] ) ) ? trim( $_POST['last_name'] )   : ''; ?>

  <p>
    <label for="first_name">
      <?php _e( 'First Name', 'loginpress' ) ?><br />

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<?php
# SHORTS
# DIRECTORY SEPARATOR
define( 'DS', DIRECTORY_SEPARATOR );
# PATH SEPARATOR
define( 'PS', PATH_SEPARATOR );

# Absolute path to the WordPress directory.
! defined( 'ABSPATH' )
	AND define( 'ABSPATH', dirname( __FILE__ ).DS );