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

Outputs or saves a AVIF Raster image from the given image.

image: 由圖象創(chuàng)建函數(shù)(例如imagecreatetruecolor())返回的 GdImage 對(duì)象。
file: 文件保存的路徑或者已打開的流資源（此方法返回后自動(dòng)關(guān)閉該流資源），如果未設(shè)置或?yàn)?null，將會(huì)直接輸出原始圖象流。
quality: quality is optional, and ranges from 0 (worst quality, smaller file) to 100 (best quality, larger file). If -1 is provided, the default value 30 is used.
speed: speed is optional, and ranges from 0 (slow, smaller file) to 10 (fast, larger file). If -1 is provided, the default value 6 is used.

成功時(shí)返回 true，或者在失敗時(shí)返回 false。

警告

如果 libgd 輸出圖像失敗，函數(shù)會(huì)返回 true。