imageresolution
(PHP 7 >= 7.2.0, PHP 8)
imageresolution — Get or set the resolution of the image
Beschreibung
imageresolution() allows to set and get the resolution of
an image in DPI (dots per inch). If the optional parameters are null,
the current resolution is returned as an indexed array. If only
resolution_x is not null, the horizontal and vertical resolution
are set to this value. If none of the optional parameters are null, 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.
Parameter-Liste
-
image -
Ein GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.
-
resolution_x -
The horizontal resolution in DPI.
-
resolution_y -
The vertical resolution in DPI.
Rückgabewerte
When used as getter,
it returns an indexed array of the horizontal and vertical resolution on
success, Bei einem Fehler wird false zurückgegeben..
When used as setter, it returns
true on success, Bei einem Fehler wird false zurückgegeben..
Changelog
| Version | Beschreibung |
|---|---|
| 8.0.0 |
resolution_x and resolution_y are now nullable.
|
Beispiele
Beispiel #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));
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Array
(
[0] => 200
[1] => 200
)
Array
(
[0] => 300
[1] => 72
)
