Draws an open polygon

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- PHP Manual
- GD and Image Functions
- Draws an open polygon

# imageopenpolygon

(PHP 7 >= 7.2.0, PHP 8)

imageopenpolygon — Draws an open polygon

### Description

Signature as of PHP 8.0.0 (not supported with named arguments)

imageopenpolygon(GdImage `$image`, array `$points`, int `$color`): bool

Alternative signature (deprecated as of PHP 8.1.0)

imageopenpolygon(
GdImage `$image`,
array `$points`,
int `$num_points`,
int `$color`
): bool

imageopenpolygon() draws an open polygon on the given `image`. Contrary to imagepolygon(), no line is drawn between the last and the first point.

### Parameters

`image`

  A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().

`points`

  An array containing the polygon's vertices, e.g.:

  points[0] | = x0
  points[1] | = y0
  points[2] | = x1
  points[3] | = y1

`num_points`

  Total number of points (vertices), which must be at least 3.

  If this parameter is omitted as per the second signature, `points` must have an even number of elements, and `num_points` is assumed to be `count($points)/2`.
`color`

  A color identifier created with imagecolorallocate().

### Return Values

Returns `true` on success or `false` on failure.

### Changelog

Version | Description
--- | ---
8.1.0 | The parameter `num_points` has been deprecated.
8.0.0 | `image` expects a GdImage instance now; previously, a valid `gd` resource was expected.

### Examples

Example #1 imageopenpolygon() example

    <?php// Create a blank image$image = imagecreatetruecolor(400, 300);// Allocate a color for the polygon$col_poly = imagecolorallocate($image, 255, 255, 255);// Draw the polygonimageopenpolygon($image, array(        0,   0,        100, 200,        300, 200    ),    3,    $col_poly);// Output the picture to the browserheader('Content-type: image/png');imagepng($image);imagedestroy($image);?>

The above example will output something similar to:

### See Also

- imagepolygon() - Draws a polygon