imageresolution

(PHP 7 >= 7.2.0)

imageresolution — Get or set the resolution of the image

Descrição

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.

Parâmetros

image: Um resource de imagem, retornado por funções de criação de imagens, como imagecreatetruecolor().
res_x: The horizontal resolution in DPI.
res_y: The vertical resolution in DPI.

Valor Retornado

When used as getter (that is without the optional parameters), it returns TRUE on success, ou FALSE em caso de falha. 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, ou FALSE em caso de falha.

Exemplos

Exemplo #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));
?>

O exemplo acima irá imprimir:

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