PHP GD Functions

This function copies a rectangular portion of one image to another image, smoothly interpolating pixel values so that, in particular, reducing the size of an image still retains a great deal of clarity.

This function will take a rectangular area from $src_image of width $src_width and height $src_height at position ($src_x, $src_y) and place it in a rectangular area of $dst_image of width $dst_width and height $dst_height at position ($dst_x, $dst_y).

If the source and destination coordinates and width and heights differ, appropriate stretching or shrinking of the image fragment will be performed.

The coordinates refer to the upper left corner.

This function can be used to copy regions within the same image, (if $dst_image is the same as $src_image), but if the regions overlap the results will be unpredictable.

The results may be less interesting than those obtained through imagecopyresampled.

This function returns TRUE on success or FALSE on failure.


<?php

bool imagecopyresized ( GdImage $dst_imageage,
                                       GdImage $src_imageage, 
                                                int $dst_x, int $dst_y, 
                                                int $src_x, int $src_y, 
                                                int $dst_width, int $dst_height, 
                                                int $src_width, int $src_height )


where,

$dst_image = The destination image identifier

$src_image = 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 

$dst_width = The destination width 

$dst_height = The destination height

$src_width = The source width 

$src_height = The source height

?>

$dst_image

The destination image identifier.

$src_image

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.

$dst_width

The destination width.

$dst_height

The destination height.

$src_width

The source width.

$src_height

The source height.

EXERCISE


<?php

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

// $lang = 'pt';
$lang = 'en';

$base_img01 = "jpeg/JPEG 024 01.jpg";
// Toledo - Spain

$dest_img01 = "png/PNG 043 01-(.3x).png";

$id_base01 = imagecreatefromjpeg($base_img01);
$base_w01 = imagesx($id_base01);
$base_h01 = imagesy($id_base01);
$dim01 = '( ' . $base_w01 . 'px X ' . $base_h01 . 'px )';

echo $base_img01; ?><br><br>
 <?php echo $dim01; ?><br><br>
<img src="<?php echo $base_img01; ?>"
 alt="<?php echo $base_img01; ?>" 
 title="<?php echo $base_img01; ?>" width="400">
 <br><br><br>

<?php

// 30% of the original image
$dest_w01 = bcmul($base_w01, 0.3); 
$dest_h01 = bcmul($base_h01, 0.3); 

$id_dest01 = imagecreatetruecolor($dest_w01, $dest_h01);

$dest_x01 = 0; 

$dest_y01 = 0; 

$src_x01 = 0; 

$src_y01 = 0; 

$bool_res01 = imagecopyresized($id_dest01, $id_base01, 
                                                   $dest_x01, $dest_y01, 
                                                   $src_x01, $src_y01, 
                                                   $dest_w01, $dest_h01, 
                                                   $base_w01, $base_h01);

if($bool_res01 == FALSE)
{
$pt = "A imagem não pôde ser redimensionada!";
$en = "The image could not be resized!";
echo '<br><br>' . $$lang . '<br><br>';
}
else
{
imagepng($id_dest01, $dest_img01);

$dest_w01 = imagesx($id_dest01);
$dest_h01 = imagesy($id_dest01);
$dim01 = '( ' . $dest_w01 . 'px X ' . $dest_h01 . 'px )';

echo $dest_img01; ?><br><br>
 <?php echo $dim01; ?><br><br>
<img src="<?php echo $dest_img01; ?>"
 alt="<?php echo $dest_img01; ?>" 
 title="<?php echo $dest_img01; ?>" width="200">
<?php
}
?>

RESULT

JPEG 024 01.jpg

( 2384px X 2411px )

JPEG 024 01.jpg apr

PNG 043 01-(.3x).png

( 715px X 723px )

PNG 043 01-(.3x).png apr

EXERCISE


<?php

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

// $lang = 'pt';
$lang = 'en';

$base_img02 = "bmp/BMP 009 03 Katedrála Sv. Víta.bmp";

$dest_img02 = "bmp/BMP 009 02 Katedrála Sv. Víta.(1.5x).bmp";
 
$id_base02 = imagecreatefrombmp( $base_img02);
$base_w02 = imagesx($id_base02);
$base_h02 = imagesy($id_base02);
$dim02 = '( ' . $base_w02 . 'px X ' . $base_h02 . 'px )';

echo $base_img02; ?><br><br>
 <?php echo $dim02; ?><br><br>
<img src="<?php echo  $base_img02; ?>"
 alt="<?php echo $base_img02; ?>" 
 title="<?php echo $base_img02; ?>" width="200">
 <br><br><br>

<?php

$dest_w02 = bcmul($base_w02, 1.5); // 50% higher 
$dest_h02 = bcmul($base_h02, 1.5); // 50% higher 

$id_dest02 = imagecreatetruecolor($dest_w02, $dest_h02);

$dest_x02 = 0;  

$dest_y02 = 0;  

$src_x02 = 0;  

$src_y02 = 0; 

$b_res02 = imagecopyresized($id_dest02, $id_base02, 
                                              $dest_x02, $dest_y02, 
                                              $src_x02, $src_y02, 
                                              $dest_w02, $dest_h02, 
                                              $base_w02, $base_h02);

if($b_res02 == FALSE)
{
$pt = "A imagem não pôde ser redimensionada!";
$en = "The image could not be resized!";
echo '<br><br>' . $$lang . '<br><br>';
}
else
{
imagepng($id_dest02,  $dest_img02);

$dest_w02 = imagesx($id_dest02);
$dest_h02 = imagesy($id_dest02);
$dim02 = '( ' . $dest_w02 . 'px X ' . $dest_h02 . 'px )';

echo $dest_img02; ?><br><br>
 <?php echo $dim02; ?><br><br>
<img src="<?php echo  $dest_img02; ?>"
 alt="<?php echo $dest_img02; ?>" 
 title="<?php echo $dest_img02; ?>" width="450">
<?php

}
?>