public function invocation( $sku, $not_used_1, $not_used_2, $text_font, $text_size ) {

		$ps[] = "50 50 moveto ({$sku}) (includetext textfont={$text_font} textsize={$text_size} height=0.5)";
		$ps[] = '/code128 /uk.co.terryburton.bwipp findresource exec';

		return implode( "\n", $ps ) . "\n";
	}
public function invocation( $sku, $not_used_1, $not_used_2, $text_font, $text_size ) {

		$ps[] = "50 50 moveto ({$sku}) (includetext textfont={$text_font} textsize={$text_size} height=0.5)";
		$ps[] = '/code128 /uk.co.terryburton.bwipp findresource exec';

		return implode( "\n", $ps ) . "\n";
	}
public function invocation ( $ sku , $ not_used_1 , $ not_used_2 , $ text_font , $ text_size ) { $ ps [ ] = "50 50 moveto ({$sku}) (includetext textfont={$text_font} textsize={$text_size} height=0.5)" ; $ ps [ ] = '/code128 /uk.co.terryburton.bwipp findresource exec' ; return implode ( "\n" , $ ps ) . "\n" ; }
SKU Invocation Code.

@see https://github.com/bwipp/postscriptbarcode/wiki/Code-128
@see https://github.com/bwipp/postscriptbarcode/wiki/Symbol-Dimensions
@see https://github.com/bwipp/postscriptbarcode/wiki/Text-Properties

@param string $sku
@param string $not_used_1
@param float $not_used_2
@param string $text_font
@param float $text_size

@return string
SKU Invocation Code .