PHP | imagearc() Function

The imagearc() function is an inbuilt function in PHP which is used to create an arc of a circle centered at the given coordinates. This function returns true on success or false on failure.

Syntax:

bool imagearc( $image, $cx, $cy, $width, $height, $start, $end, 
$color )

Parameters: This function accepts eight parameters as mentioned above and described below:

• $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
• $cx: It is used to set x-coordinate of the center.
• $cy: It is used to set y-coordinate of the center.
• $width: The width of arc.
• $height: The height of arc.
• $start: It is used to set the arc start angle, in degrees.
• $end: It is used to set the arc end angle, in degrees. 0° is located at the three-o’clock position, and the arc is drawn clockwise.
• $color: It sets the color of image. A color identifier created by imagecolorallocate() function.

Return Value: This function returns true on success or false on failure.

Below programs illustrate the imagearc() function in PHP.

Program 1:

<?php

// It create the size of image or blank image.
$image_size = imagecreatetruecolor(500, 300);

// Set the background color of image.
$bg = imagecolorallocate($image_size, 0, 103, 0);

// Fill background with above selected color.
imagefill($image_size, 0, 0, $bg);

// Set the colors of image
$white_color = imagecolorallocate($image_size, 255, 255, 255);
$red_color = imagecolorallocate($image_size, 255, 0, 0);
$green_color = imagecolorallocate($image_size, 0, 255, 0);
$blue_color = imagecolorallocate($image_size, 0, 0, 255);

// Draw the circle
imagearc($image_size, 200, 150, 200, 200, 0, 360, $white_color);
imagearc($image_size, 200, 150, 150, 150, 25, 155, $red_color);
imagearc($image_size, 260, 110, 50, 50, 0, 360, $green_color);
imagearc($image_size, 140, 110, 50, 50, 0, 360, $blue_color);

// Output image in the browser
header("Content-type: image/png");
imagepng($image_size);

// Free memory
imagedestroy($image_size);

?>

Output:

Program 2:

<?php

// It create the size of image or blank image.
$image_size = imagecreatetruecolor(500, 300);

// Set the background color of image.
$bg = imagecolorallocate($image_size, 0, 102, 0);

// Fill background with above selected color.
imagefill($image_size, 0, 0, $bg);

// Set the colors of image
$white_color = imagecolorallocate($image_size, 255, 255, 255);
$red_color = imagecolorallocate($image_size, 255, 0, 0);
$black_color = imagecolorallocate($image_size, 0, 0, 0);

// Draw the arc circle image
imagearc($image_size, 200, 150, 200, 200, 0, 360, $white_color);
imagearc($image_size, 200, 150, 150, 150, 0, 360, $red_color);
imagearc($image_size, 200, 150, 50, 50, 0, 360, $black_color);

// Output image in the browser
header("Content-type: image/png");
imagepng($image_size);

// Free memory
imagedestroy($image_size);

?>

Output:

Reference: http://php.net/manual/en/function.imagearc.php