使用指定的编码器和图像编码器参数，将该图像保存到指定的流。

Image to the specified file, with the specified encoder and image-encoder parameters.

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使用指定的编码器和影像编码器参数，将此影像储存至指定的资料流。

Saves this image to the specified stream, with the specified encoder and image encoder parameters.

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使用PHP v4时，必须测试本例中的参数类型，以绝对确保编码器传递类型正确的对象。

Using PHP V4, you would have to test the argument types in this example to be absolutely sure that the coder passes around the right kind of objects.

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