sm-encode-lib

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  1. sm-encode-lib

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<?php
class SM_EncodeLib
{
    function SM_Encode( $string )
    {
        $a = array( );
        $r = array( );
        $l = array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j' );
        $t = array( );
        $x = array( );
        
        for( $i = 0; $i < strlen( $string ); $i++ )
            if( $i & 1 )
                $a[] = $string[ $i ];
                
        for( $j = 0; $j < strlen( $string ); $j++ )
            if( ~$j & 1 )
                $a[] = $string[ $j ];
            
        for( $k = 0; $k < count( $a ); $k++ )
            $r[] = ord( $a[ $k ] );
        
        $s = implode( '', $r );
                
        for( $m = 0; $m < strlen( $s ); $m++ )
            $t[ $m ] = $l[ $s[ $m ] ];
        
        $b = strrev( strlen( $string ) );
        
        $t = implode( '', $t ) . '-' . $b;
        
        return $t;        
     }
    
    function SM_Decode( $string )
    {
        $a = strpos( $string, '-' );
        $s = substr( $string, 0, $a );
        $b = array( );
        $c = array( );
        $d = array( );
        
        $l = array( 'a' => 0, 'b' => 1, 'c' => 2, 'd' => 3, 'e' => 4, 'f' => 5, 'g' => 6, 'h' => 7, 'i' =>8, 'j' => 9 );
        
        for( $i = 0; $i < strlen( $s ); $i++ )
            $b[ $i ] = $l[ $s[ $i ] ];
            
        $b = implode( '', $b );
        
        for( $m = 0; $m < strlen( $b ); $m++ )
            if( substr( $b, $m, 3 ) > 127 )
            {
                $c[] = chr( substr( $b, $m, 2 ) );
                $m++;
            }
            else
            {
                $c[] = chr( substr( $b, $m, 3 ) );
                $m += 2;
            }
            
        $z = implode( '', $c );    
        
        $x = floor( strrev( substr(    $string, $a + 1 ) ) ) / 2;
        
        $on = substr( $z, 0, $x );
        $ev = substr( $z, $x );
        
        for( $g = 0; $g < ( $x + $x + 1 ); $g++ )
        {    
            if( ~$g & 1 )
            {
                if( !$w )
                    $w = 0;
                
                $d[ $g ] = $ev[ $w ];
                $w++;
            }
            if( $g & 1 )
            {
                if( !$v )
                    $v = 0;
                
                $d[ $g ] = $on[ $v ];
                $v++;
            }
        }
        
        $z = implode( '', $d );
        
        return $z;
    }
}
?>

 
 

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