imagecreatefrompng() returns an
image identifier representing the image obtained from the
given filename.
imagecreatefrompng() returns an
empty string on failure. It also outputs an error message,
which unfortunately displays as a broken link in a browser.
To ease debugging the following example will produce an error
PNG:
提示: 如果fopen wrappers已啟動,則可藉此函數把檔名當成URL使用。 參考fopen()有更多關於如何指定檔名的細節 和附錄 I支援URL協定的列表。
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