<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn://localhost/soap/server.php" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:getAllProducts/></SOAP-ENV:Body></SOAP-ENV:Envelope>

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://localhost/soap/server.php" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:getAllProductsResponse><return SOAP-ENC:arrayType="SOAP-ENC:Struct[4]" xsi:type="SOAP-ENC:Array"><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">1</id><title xsi:type="xsd:string">Details about  Canon EF 50mm f/1.8 STM Lens</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</description><price xsi:type="xsd:string">$89.99</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">2</id><title xsi:type="xsd:string">Refurbished Dell Latitude E5420 Laptop - i3 - 4GB RAM - 250GB HDD - Win 10 Pro</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting.</description><price xsi:type="xsd:string">US $4.08</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">3</id><title xsi:type="xsd:string"> Details about  M3 Sport Fitness Smart Wrist Band Pedometer Activity Tracker Bracelet Watch New </title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</description><price xsi:type="xsd:string">$5.50</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">4</id><title xsi:type="xsd:string"> Details about  Samsung Galaxy S9+ Plus(LATEST) SM-G965U 64GB T-Mobile AT&amp;T Verizon GSM Unlocked</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries</description><price xsi:type="xsd:string">$399.88</price></item></return></ns1:getAllProductsResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn://localhost/soap/server.php" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:getAllProducts/></SOAP-ENV:Body></SOAP-ENV:Envelope>

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://localhost/soap/server.php" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:getAllProductsResponse><return SOAP-ENC:arrayType="SOAP-ENC:Struct[4]" xsi:type="SOAP-ENC:Array"><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">1</id><title xsi:type="xsd:string">Details about  Canon EF 50mm f/1.8 STM Lens</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</description><price xsi:type="xsd:string">$89.99</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">2</id><title xsi:type="xsd:string">Refurbished Dell Latitude E5420 Laptop - i3 - 4GB RAM - 250GB HDD - Win 10 Pro</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting.</description><price xsi:type="xsd:string">US $4.08</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">3</id><title xsi:type="xsd:string"> Details about  M3 Sport Fitness Smart Wrist Band Pedometer Activity Tracker Bracelet Watch New </title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</description><price xsi:type="xsd:string">$5.50</price></item><item xsi:type="SOAP-ENC:Struct"><id xsi:type="xsd:string">4</id><title xsi:type="xsd:string"> Details about  Samsung Galaxy S9+ Plus(LATEST) SM-G965U 64GB T-Mobile AT&amp;T Verizon GSM Unlocked</title><description xsi:type="xsd:string">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries</description><price xsi:type="xsd:string">$399.88</price></item></return></ns1:getAllProductsResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>

public function getAll() {
    try {       
//        return $this->soap_instance->getAllProducts(); // au lieu de faire un return du résultat de l'appel
        $res = $this->soap_instance->getAllProducts(); // on fait d'abord l'appel (on garde le résultat dans $res)

        // tu peux alors insérer le code ici pour voir les flux qui ont été envoyés et retournés

        return $res; // et enfin on retourne le résultat pour affichage ou autre...
    } catch (Exception $ex) {
        exit("soap error: " . $ex->getMessage());
    }
}

<?xml version="1.0" ?>
<SOAP-ENV:Envelope
    SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
        xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    >
        <!-- Optional Soap Header -->
    <SOAP-ENV:Header>
        
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
               
                <!-- Function names and attributes -->
                <getProduct>
                          <id>1</id>
                </getProduct>

                <!-- Optional Soap Fault -->
        <SOAP-ENV:Fault>
        
        </SOAP-ENV:Fault>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

<?xml version="1.0" ?>
<SOAP-ENV:Envelope
    SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
        xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    >
        <!-- Optional Soap Header -->
    <SOAP-ENV:Header>
        
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
               
                <!-- Function names and attributes -->
                <getProductResponse>
                          <return>
                                 <id>1</i>
                                 <title>Apple PC</title>
                                 <price>1000</price>
                          </return>
                </getProductResponse>

                <!-- Optional Soap Fault -->
        <SOAP-ENV:Fault>
        
        </SOAP-ENV:Fault>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

echo "<pre>";

echo htmlentities($this->soap_instance->__getLastRequest());

echo "</pre>";

echo "<pre>";

echo htmlentities($this->soap_instance->__getLastResponse());

echo "</pre>";