GD and Image Functions
PHP Manual

imageopenpolygon

Draws an open polygon

Description

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

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

Alternative signature (deprecated as of PHP 8.1.0)

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

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 polygon
imageopenpolygon($image, array(
        0,   0,
        100, 200,
        300, 200
    ),
    $col_poly);

// Output the picture to the browser
header('Content-type: image/png');

imagepng($image);
?>

The above example will output something similar to:

Output of example : imageopenpolygon()

See Also

  • imagepolygon