imageresolution

(PHP 7 >= 7.2.0)

imageresolutionGet or set the resolution of the image

Descrizione

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

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.

Elenco dei parametri

image

Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

res_x

The horizontal resolution in DPI.

res_y

The vertical resolution in DPI.

Valori restituiti

When used as getter (first signature), it returns an indexed array of the horizontal and vertical resolution on success, o FALSE in caso di fallimento. When used as setter (second signature), it returns TRUE on success, o FALSE in caso di fallimento.

Esempi

Example #1 Setting and getting the resolution of an image

<?php
$im 
imagecreatetruecolor(100100);
imageresolution($im200);
print_r(imageresolution($im));
imageresolution($im30072);
print_r(imageresolution($im));
?>

Il precedente esempio visualizzerĂ :

Array
(
    [0] => 200
    [1] => 200
)
Array
(
    [0] => 300
    [1] => 72
)
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