PHP GD Functions

This function copy a part of $src_im onto $dst_im starting at coordinates indicated by $src_x, $src_y with the width $src_width and height $src_height and will be copied at coordinates designated by $dest_x and $dest_y.

0 ≤ $pct ≤ 100.

If $pct = 0 no actions is taken.

If $pct = 100 this function behaves identically to imagecopy for pallete images, except for ignoring alpha components, while it implements alpha transparency for true colour images.

This function returns TRUE on success or FALSE on failure.


<?php

bool imagecopymerge ( GdImage $dst_image,
                                      GdImage $src_image, 
                                               int $dst_x, int $dst_y, 
                                               int $src_x, int $src_y, 
                                               int $src_width, int $src_height , 
                                               int $pct )


where,

$dst_im = The destination image identifier

$src_im = The source image identifier

$dst_x = The x-coordinate of destination point 

$dst_y = The y-coordinate of destination point 

$src_x = The x-coordinate of source point 

$src_y = The y-coordinate of source point 

$src_width= The source width 

$src_height = The source height

$pct = The percentage of the two merged images

?>

$dst_im

The destination image identifier.

$src_im

The source image identifier.

$dst_x

The x-coordinate of destination point.

$dst_y

The y-coordinate of destination point.

$src_x

The x-coordinate of source point.

$src_y

The y-coordinate of source point.

$src_width

The source width.

$src_height

The source height.

$pct

The percentage of the two merged images.

EXERCISE


<?php

echo 'PHP VERSION: ' . PHP_VERSION . '<br><br>';

$seal_img = "png/Copyright-red&white.png";
// https://trip.ed48.com

$base_img = "png/PNG 044 01.png";
// Puerta de Alcalá - Madrid (ESP)

$dest_img = "png/PNG 044 01(copyrighted).png";

?>
 <?php echo $seal_img; ?><br><br>
<img src="<?php echo $seal_img; ?>"
 alt="<?php echo $seal_img; ?>" 
 title="<?php echo $seal_img; ?>" width="70"><br><br>

<?php echo $base_img; ?><br><br>
<img src="<?php echo $base_img; ?>"
 alt="<?php echo $base_img; ?>" 
 title="<?php echo $base_img; ?>" width="400"><br><br><br>
 
<?php
$id_base = imagecreatefrompng($base_img);

$id_seal = imagecreatefrompng($seal_img);

$seal_w = imagesx($id_seal);
$seal_h = imagesy($id_seal);

$base_w = imagesx($id_base);
$base_h = imagesy($id_base);

$base_x = imagesx($id_base) - $seal_w - 5;
$base_y = imagesy($id_base) - $seal_h - 55;

imagecopymerge($id_base, $id_seal, 
                            $base_x, $base_y, 
                            0, 0, 
                            $seal_w, $seal_h, 
                            100);

imagepng($id_base, $dest_img);
?>
<?php echo $dest_img; ?><br><br>
<img src="<?php echo $dest_img; ?>"
 alt="<?php echo $dest_img; ?>" 
 title="<?php echo $dest_img; ?>" width="400">