sizeof

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          sizeof() - return the number of elements in an array,
          mapping, buffer or string

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          int sizeof( mixed var );

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          Return the number of elements in an array, mapping, string
          or buffer 'var'. If `var' is not an array, mapping, string,
          or buffer, then zero (0) is returned.

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          allocate(3), allocate_mapping(3), strlen(3)

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