imageresolution
(PHP 7 >= 7.2.0)
imageresolution — Get or set the resolution of the image
Description
imageresolution() allows to set and get the resolution of
an image in DPI (dots per inch). If none of the optional parameters is given,
the current resolution is returned as indexed array. If only
res_x is given, the horizontal and vertical resolution
are set to this value. If both optional parameters are given, the horizontal
and vertical resolution are set to these values, respectively.
The resolution is only used as meta information when images are read from and written to formats supporting this kind of information (curently PNG and JPEG). It does not affect any drawing operations. The default resolution for new images is 96 DPI.
Parameters
-
image -
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
-
res_x -
The horizontal resolution in DPI.
-
res_y -
The vertical resolution in DPI.
Return Values
When used as getter (first signature),
it returns an indexed array of the horizontal and vertical resolution on
success, or FALSE on failure.
When used as setter (second signature), it returns
TRUE on success, or FALSE on failure.
Examples
Example #1 Setting and getting the resolution of an image
<?php
$im = imagecreatetruecolor(100, 100);
imageresolution($im, 200);
print_r(imageresolution($im));
imageresolution($im, 300, 72);
print_r(imageresolution($im));
?>
The above example will output:
Array
(
[0] => 200
[1] => 200
)
Array
(
[0] => 300
[1] => 72
)
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-imageresolution.html
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References
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