How to convert ICO to PNG format in PHP?

Is there any more complete class library that can convert ICO to PNG?
Previously found a class library on the Internet, but does not support the size of 32 and 64, how to make it support any size of ico it?
Or do you have a better class library? Thank you!

Previously found class library: http://blog.csdn.net/phpnewnew/article/details/7848932

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Is there any more complete class library that can convert ICO to PNG?
Previously found a class library on the Internet, but does not support the size of 32 and 64, how to make it support any size of ico it?
Or do you have a better class library? Thank you!

Previously found class library: http://blog.csdn.net/phpnewnew/article/details/7848932

can be used ImageMagick

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