PHP | imagecolorallocate() Function
Last Updated :
23 Aug, 2019
The imagecolorallocate() function is an inbuilt function in PHP which is used to set the color in an image. This function returns a color which is given in RGB format.
Syntax:
int imagecolorallocate ( $image, $red, $green, $blue )
Parameters: This function accepts four 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.
- $red: This parameter is used to set value of red color component.
- $green: This parameter is used to set value of green color component.
- $blue: This parameter is used to set value of blue color component.
Return Value: This function returns a color identifier on success or FALSE if the color allocation failed.
Below programs illustrate the imagecolorallocate() function in PHP.
Program 1:
<?php
$image_size = imagecreatetruecolor(500, 300);
$bg = imagecolorallocate( $image_size , 0, 103, 0);
imagefill( $image_size , 0, 0, $bg );
header( "Content-type: image/png" );
imagepng( $image_size );
imagedestroy( $image_size );
?>
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Output:
Program 2:
<?php
$image_size = imagecreatetruecolor(500, 300);
$bg = imagecolorallocate( $image_size , 0, 103, 0);
imagefill( $image_size , 0, 0, $bg );
$white_color = imagecolorallocate( $image_size , 255, 255, 255);
imagearc( $image_size , 200, 150, 200, 200, 0, 360, $white_color );
header( "Content-type: image/png" );
imagepng( $image_size );
imagedestroy( $image_size );
?>
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Output:
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Reference: http://php.net/manual/en/function.imagecolorallocate.php
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