PHP | imagearc() Function

Last Updated : 23 Aug, 2019

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

<?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

<?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);

?>