It should be clear that the set version of the function doesn't change the image it self, just the resource in memory, which probably is fine if you didn't save the image yet. If your use case is for an image that is already on disk, image you should always do something like:
imageresolution($img, 300, 300);
imagepng($img, $filname, $quality);
imageresolution
(PHP 7 >= 7.2.0)
imageresolution — Get or set the resolution of the image
Descrierea
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.
Parametri
-
image -
O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().
-
res_x -
The horizontal resolution in DPI.
-
res_y -
The vertical resolution in DPI.
Valorile întoarse
When used as getter (first signature),
it returns an indexed array of the horizontal and vertical resolution on
success, sau false în cazul eșecului.
When used as setter (second signature), it returns
true on success, sau false în cazul eșecului.
Exemple
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));
?>
Exemplul de mai sus va afișa:
Array
(
[0] => 200
[1] => 200
)
Array
(
[0] => 300
[1] => 72
)
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User Contributed Notes 1 note
fernando dot fonseca at afteryou dot pt ¶
3 years ago
