Complex flow with PHP as the scripting language

gistfile1.xml

<flow name="flow" doc:name="flow">
    <http:inbound-endpoint exchange-pattern="request-response"
            host="localhost" port="8081" path="runPHP" doc:name="HTTP" />
    <object-to-string-transformer doc:name="Object to String" />
    <scripting:component doc:name="Analyze credit request">
        <scripting:script engine="php">
            <scripting:text>
                <![CDATA[
                    
                    <?php 

                    $log->info("Hello from PHP, mule!");
                    
                    $request = json_decode($payload, true);
                    
                    if (strcmp(substr($request["customerId"], 0, 3), "ABC") == 0) $factor = 3;
                    else if (strcmp(substr($request["customerId"], 0, 3), "DEF") == 0) $factor = 2;
                    
                    if ($request["requestedAmount"] > ($factor * $request["averageIncome"])) {
                            
                            $message->setOutboundProperty("outcome", "rejected");
                            $request["maxAmount"] = ($factor * $request["averageIncome"]);
                    
                    } else {
                    
                            $message->setOutboundProperty("outcome", "approved");
                            
                    }
                    
                    return json_encode($request);
                    
                    ?>
                ]]>
            </scripting:text>
        </scripting:script>
    </scripting:component>
    <choice doc:name="Choice">
        <when expression="outcome=approved" evaluator="header">
            <processor-chain>
                <logger
                        message="REQUEST APPROVED: #[json:customerId] for #[json:requestedAmount]"
                        level="INFO" doc:name="Approved request logger" />
                <scripting:component doc:name="Prepare approval response">
                    <scripting:script engine="php">
                        <scripting:text>
                            <![CDATA[
                                <?php
                                
                                $response["outcome"] = $message->getProperty("outcome");									
                                return json_encode($response);
                                
                                ?>
                            ]]>
                        </scripting:text>
                    </scripting:script>
                </scripting:component>
            </processor-chain>
        </when>
        <when expression="outcome=rejected" evaluator="header">
            <processor-chain>
                <logger
                        message="REJECTED REQUEST: #[json:customerId] for #[json:requestedAmount], max allowable: #[json:maxAmount]"
                        level="INFO" doc:name="Rejected request logger" />
                <scripting:component doc:name="Prepare rejection response">
                    <scripting:script engine="php">
                        <scripting:text>
                            <![CDATA[
                            
                                <?php

                                $request = json_decode($payload, true);
                                
                                $response["outcome"] = $message->getProperty("outcome");
                                $response["maxAmount"] = $request["maxAmount"];
                                
                                return json_encode($response);

                                ?>
                            ]]>
                        </scripting:text>
                    </scripting:script>
                </scripting:component>
            </processor-chain>
        </when>
    </choice>
</flow>