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Actually, arrays have no native built-in type under XML Schemas. At WSDL, when you work with array, you can use the soapenc:Array type. But not directly. First, you create a custom complex type by extending the soapenc:Array type. Example, you want to say:
array("Ali", "Baba");

You can use such as:

<xsd:complexType name="ArrayOfstring">
  <xsd:complexContent>
    <xsd:restriction base="soapenc:Array">
      <xsd:attribute ref="soapenc:arrayType" wsdl:arrayType="xsd:string[]">
    </xsd:restriction>
  </xsd:complexContent>
</xsd:complexType>

We should follow rule in WSDL 1.1:

• The name should be ArrayOfXXXX, where XXXX is the type of items contained in the array.
• Specify the type of items contained and its dimensions using a default value for the soapenc:arrayType attribut.
• Name space associated with the wsdl prefix in table below: