imageresolution

(PHP 7 >= 7.2.0)

imageresolution — Get or set the resolution of the image

Beschreibung

mixed imageresolution ( resource $image [, int $res_x [, int $res_y ]] )

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.

Parameter-Liste

image: Eine von den verschiedenen Erzeugungsfunktionen wie imagecreatetruecolor() gelieferte Grafikressource.
res_x: The horizontal resolution in DPI.
res_y: The vertical resolution in DPI.

Rückgabewerte

When used as getter (that is without the optional parameters), it returns TRUE on success, Im Fehlerfall wird FALSE zurückgegeben.. When used as setter (that is with one or both optional parameters given), it returns an indexed array of the horizontal and vertical resolution on success, Im Fehlerfall wird FALSE zurückgegeben..

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
)