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説明size_t php_stream_copy_to_mem ( php_stream * src, char ** buf, size_t maxlen, int persistent)
php_stream_copy_to_mem() allocates a buffer maxlen+1 bytes in length using pemalloc() (passing persistent). It then reads maxlen bytes from src and stores them in the allocated buffer.
The allocated buffer is returned in buf, and the number of bytes successfully read. You, the caller, are responsible for freeing the buffer by passing it and persistent to pefree().
If you want to copy all remaining data from the src stream, pass the constant PHP_STREAM_COPY_ALL as the value of maxlen.