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imagepng

(PHP 4, PHP 5, PHP 7, PHP 8)

imagepng — Output a PNG image to either the browser or a file

Descrizione

imagepng(
    GdImage $image,
    resource|string|null $file = null,
    int $quality = -1,
    int $filters = -1
): bool

Outputs or saves a PNG image from the given image.

Elenco dei parametri

image

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

file

Il percorso in cui salvare il file. Se non è impostato o è null, viene restituito il flusso raw dell'immagine.

Nota:

null is invalid if the quality and filters arguments are not used.

quality

Compression level: from 0 (no compression) to 9. The default (-1) uses the zlib compression default. For more information see the » zlib manual.

filters

Allows reducing the PNG file size. It is a bitmask field which may be set to any combination of the PNG_FILTER_* constants. PNG_NO_FILTER or PNG_ALL_FILTERS may also be used to respectively disable or activate all filters. The default value (-1) disables filtering.

Attenzione

The filters parameter is ignored by system libgd.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Attenzione

However, if libgd fails to output the image, this function returns true.

Errori/Eccezioni

Throws a ValueError if quality is invalid.

Log delle modifiche

Versione Descrizione
8.4.0 Now throws a ValueError if quality is invalid.
8.0.0 image expects a GdImage instance now; previously, a valid gd resource was expected.

Esempi

<?php
$im = imagecreatefrompng("test.png");

header('Content-Type: image/png');

imagepng($im);
?>

Vedere anche: