wpdk-colors.php

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<?php
class WPDKColors extends WPDKObject {

  public $__version = '1.0.2';

  public static function rgb2hex( $value )
  {
    if ( empty( $value ) ) {
      return false;
    }
    $value = trim( $value );
    $out   = false;
    if ( preg_match( "/^[0-9ABCDEFabcdef\#]+$/i", $value ) ) {
      $value = str_replace( '#', '', $value );
      $l     = strlen( $value ) == 3 ? 1 : ( strlen( $value ) == 6 ? 2 : false );

      if ( $l ) {
        unset( $out );
        $out['red'] = hexdec( substr( $value, 0, 1 * $l ) );
        $out['green'] = hexdec( substr( $value, 1 * $l, 1 * $l ) );
        $out['blue'] = hexdec( substr( $value, 2 * $l, 1 * $l ) );
      }
      else {
        $out = false;
      }

    }
    elseif ( preg_match( "/^[0-9]+(,| |.)+[0-9]+(,| |.)+[0-9]+$/i", $value ) ) {
      $spr = str_replace( array( ',', ' ', '.' ), ':', $value );
      $e   = explode( ":", $spr );
      if ( count( $e ) != 3 ) {
        return false;
      }
      $out = '#';
      for ( $i = 0; $i < 3; $i++ ) {
        $e[$i] = dechex( ( $e[$i] <= 0 ) ? 0 : ( ( $e[$i] >= 255 ) ? 255 : $e[$i] ) );
      }

      for ( $i = 0; $i < 3; $i++ ) {
        $out .= ( ( strlen( $e[$i] ) < 2 ) ? '0' : '' ) . $e[$i];
      }
      $out = strtoupper( $out );
    }
    else {
      $out = false;
    }
    return $out;
  }

  public static function hexAddition( $hex, $num )
  {
    $rgb = self::rgb2hex( $hex );
    if ( empty( $rgb ) ) {
      return $hex;
    }

    foreach ( $rgb as $key => $val ) {
      $rgb[$key] += $num;
      $rgb[$key] = ( $rgb[$key] < 0 ) ? 0 : $rgb[$key];
    }
    $hex = self::rgb2hex( implode( ',', $rgb ) );

    return $hex;
  }

}