dll - php custom extension loading problem

I wrote a php extension myself. It cannot be loaded and no error is reported. However, when calling the function in the extension, an undefined function is displayed? ? Urgent, urgent, God please help! ! !

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I wrote a php extension myself. It cannot be loaded and no error is reported. However, when calling the function in the extension, an undefined function is displayed? ? Urgent, urgent, God please help! ! !