/01.Source/01.CORE/includes/utf8/php_string_handler.php

<?php



/**

 * @Project NUKEVIET 3.0

 * @Author VINADES.,JSC (contact@vinades.vn)

 * @Copyright (C) 2010 VINADES.,JSC. All rights reserved

 * @Createdate 22/8/2010, 19:33

 */



if ( ! defined( 'NV_MAINFILE' ) ) die( 'Stop!!!' );



/**

 * nv_internal_encoding()

 * 

 * @param mixed $encoding

 * @return

 */

function nv_internal_encoding ( $encoding )

{

    return false;

}



/**

 * nv_strlen()

 * 

 * @param mixed $string

 * @return

 */

function nv_strlen( $string )

{

    return preg_match_all( '/./u', $string, $tmp );

}



/**

 * nv_substr()

 * 

 * @param mixed $string

 * @param mixed $start

 * @param mixed $length

 * @return

 */

function nv_substr( $string, $start, $length )

{

    $nv_strlen = nv_strlen( $string );

    if ( $start < 0 ) $start = $nv_strlen + $start;

    if ( $length < 0 ) $length = $nv_strlen - $start + $length;

    $xlen = $nv_strlen - $start;

    $length = ( $length > $xlen ) ? $xlen : $length;

    preg_match( '/^.{' . $start . '}(.{0,' . $length . '})/us', $string, $tmp );



    return ( isset( $tmp[1] ) ) ? $tmp[1] : false;

}



/**

 * nv_substr_count()

 * 

 * @param mixed $haystack

 * @param mixed $needle

 * @return

 */

function nv_substr_count( $haystack, $needle )

{

    $needle = preg_quote( $needle, '/' );

    preg_match_all( '/' . $needle . '/u', $haystack, $dummy );

    return count( $dummy[0] );

}



/**

 * nv2_strpos()

 * 

 * @param mixed $haystack

 * @param mixed $needle

 * @param integer $offset

 * @return

 */

function nv_strpos( $haystack, $needle, $offset = 0 )

{

    $offset = ( $offset < 0 ) ? 0 : $offset;

    if ( $offset > 0 )

    {

        preg_match( '/^.{' . $offset . '}(.*)/us', $haystack, $dummy );

        $haystack = ( isset( $dummy[1] ) ) ? $dummy[1] : '';

    }



    $p = strpos( $haystack, $needle );

    if ( $haystack == '' or $p === false ) return false;

    $r = $offset;

    $i = 0;



    while ( $i < $p )

    {

        if ( ord( $haystack[$i] ) < 128 )

        {

            $i = $i + 1;

        }

        else

        {

            $bvalue = decbin( ord( $haystack[$i] ) );

            $i = $i + strlen( preg_replace( '/^(1+)(.+)$/', '\1', $bvalue ) );

        }

        $r++;

    }



    return $r;

}



/**

 * nv_strrpos()

 * 

 * @param mixed $haystack

 * @param mixed $needle

 * @param mixed $offset

 * @return

 */

function nv_strrpos( $haystack, $needle, $offset = null )

{

    if ( is_null( $offset ) )

    {



        $ar = explode( $needle, $haystack );



        if ( count( $ar ) > 1 )

        {

            array_pop( $ar );

            $haystack = join( $needle, $ar );

            return nv_strlen( $haystack );

        }



        return false;

    }

    else

    {

        if ( ! is_int( $offset ) )

        {

            trigger_error( 'nv_strrpos expects parameter 3 to be long', E_USER_WARNING );

            return false;

        }



        $haystack = nv_substr( $haystack, $offset );



        if ( false !== ( $pos = nv_strrpos( $haystack, $needle ) ) )

        {

            return $pos + $offset;

        }



        return false;

    }

}



/**

 * nv_strtolower()

 * 

 * @param mixed $string

 * @return

 */

function nv_strtolower( $string )

{

    include ( NV_ROOTDIR . '/includes/utf8/lookup.php' );



    return strtr( $string, $utf8_lookup['strtolower'] );

}



/**

 * nv_strtoupper()

 * 

 * @param mixed $string

 * @return

 */

function nv_strtoupper( $string )

{

    include ( NV_ROOTDIR . '/includes/utf8/lookup.php' );



    return strtr( $string, $utf8_lookup['strtoupper'] );

}



?>