/trasweb/common/helpers/String.class.php

<?php
/**
New Licence bsd:
Copyright (c) <2012>, Manuel Jesus Canga Muñoz
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the Trasweb.net nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL Manuel Jesus Canga Muñoz BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

/** ***************************************************************************
	Esta clase sirve para el manejo de cadenas
*************************************************************************** */

class String
{

    /**
        Convierte un string en un array desglosado del namespace
        @param String $_namespace String namespace que se desglosara.
    */
    function toNamespace($_namespace = NULL) {
        $info = array('module' => NULL, 'component' => NULL, "namespace" => '', "full_namespace" => $_namespace, "last" = NULL );

        //Si no se especifico un namespace, no hay nada que hacer
        if(empty($_namespace)) return $info;
        
        //Eliminamos la posible barra inclinada del principio del namespace
        if ( "\\" == $_namespace[0] ) {
            $namespace = substr($_namespace,1);
        }else {
            $namespace = $_namespace;
        }

        //Si despues de quitar la barra, vemos que no queda nada. Obvio que no podemos seguir.
       if(empty($namespace) ) return $info;

        //Troceamos el namespace
       $namespace_split = explode("\\", $namespace );
       
       //El primer elemento del namespace siempre sera un componente. 
        $info["component"] = Filter::alphameric($namespace[0]);
        
       //Si el componente ha resultado no valido, no continuamos
        if(empty($info["component"]) ) {
            return $info;
        }


        //El segundo elemento del namespace, si es que existe, sera siempre un modulo       
       if(count($namespace) == 2  ) {
            $info["module"] = Filter::alphameric($namespace[1]);
            //Si el modulo ha resultado no valido, invalidamos todo lo anterior y salimos
            if(empty($info["module"])) {
                $info["component"] = NULL;
                return $info;
            }
            $info["last"] = $info["module"];
        }else {
            $info["last"] = $info["component"];
        }

        $info["namespace"] = $namespace;

        return $info;
    }


	/** 
        Cortamos una serie de carácteres de la cadena 
        @param String $_string: La  cadena que queremos cortar
        @param Int $_length: El numero de caracteres que permaneceran en la cadena original
    */
	function cut($_string, $_length = 1000) { return @substr(trim($_string), 0, $_length ); }

	/** Convert a string in a url */
	function convertUrl($_string, $otros_permitidos = null) {

		//Convertimos semiválidos a carácteres válidos
		$_antes = array("á", "é", "í", "ó", "ú", "ä","ë", "ï", "ö", "ü", "ñ", "&", " ", "_", "Á","É", "Í", "Ó", "Ú");
		$_despues = array("a", "e", "i", "o", "u", "a","e", "i", "o", "u", "n", "y", "-", "-", "a","e", "i", "o", "u");
		$_string = str_replace($_antes, $_despues, $_string);

		//quitamos aquellos carácteres que no sean alfanumericos o guion
		$_string  = preg_replace("/^A-Za-z0-9-". $otros_permitidos."/", "", strtolower($_string) );

		//Quitamos todos aquellos guiones que se hayan quedado juntos. Ejemplo: mi---noticia -> mi-noticia
		$_string = preg_replace("/-{2,}/","-", $_string);

		//Quitamos todos aquellos guiones del principio y del final de la cadena. ej: ---prueba--- -> prueba
		$_string = preg_replace("/^-|-+$/","",$_string);

		//Devolvemos la url urlcodeada por si acaso queda algo raro
 		return urlencode($_string);
	}

	/** Mi propio explode
		splitit(".", "archivo.pdf.tar.gz",  2) -> archivo.pdf  | tar.gz
		splitit(".","archivo.pdf.zip.tar.gz", -2) -> archivo.pdf.zip | tar.gz
		splitit(".", "archivo.pdf.zip.tar.gz") -> archivo | pdf | zip | tar | gz ( explode ) */
	function splitit($_sep, $_string, $_limit = 0) {
	
		$array = explode($_sep, $_string);
		if($_limit == 0) 
			return $array;
		else if($_limit >0)  {
			$array_copy = $array;
			return Array( 
						0 => implode($_sep, array_splice($array, 0, $_limit)), 
						1 => implode($_sep, array_splice($array_copy, $_limit))
					);
		} else {
			$array_copy = $array;
			return 	Array( 
						0 => implode($_sep,array_splice($array, 0, $_limit)), 
						1 => implode($_sep,array_splice($array_copy, $_limit))
					);
		}
	}

}