Add PHP version of kata

php/src/Invoice.php

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+<?php
+
+namespace Theatrical;
+
+class Invoice
+{
+    public string $customer;
+    public array $performances;
+
+    public function __construct($customer, $performances)
+    {
+        $this->customer = $customer;
+        $this->performances = $performances;
+    }
+    
+}

php/src/Performance.php

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+<?php
+
+namespace Theatrical;
+
+class Performance 
+{
+    public string $play_id;
+    public int $audience;
+
+    public function __construct($play_id, $audience)
+    {
+        $this->play_id = $play_id;
+        $this->audience = $audience;
+    }
+}

php/src/Play.php

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+<?php
+
+namespace Theatrical;
+
+class Play 
+{
+    public string $name;
+    public string $type;
+
+    public function __construct($name, $type)
+    {
+        $this->name = $name;
+        $this->type = $type;
+    }
+
+    public function __toString()
+    {
+        return (string) $this->name . ' : ' . $this->type;
+    }
+}

php/src/StatementPrinter.php

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+<?php
+
+namespace Theatrical;
+use Theatrical\Play;
+use Theatrical\Invoice;
+use Theatrical\Performance;
+
+class StatementPrinter
+{
+    public function print(Invoice $invoice, array $plays) 
+    {
+        $totalAmount = 0;
+        $volumeCredits = 0;
+
+        $result = 'Statement for ' . $invoice->customer . '\n';
+
+        foreach($invoice->performances as $performance)
+        {
+            $play = $plays[$performance->play_id];
+
+            $thisAmount = 0;
+
+            switch($play->type)
+            {
+                case "tragedy":
+                    $thisAmount = 40000;
+                    if($performance->audience > 30)
+                    {
+                        $thisAmount += 1000 * ($performance->audience - 30);
+                    }
+                    break;
+
+                case "comedy":
+                    $thisAmount = 30000;
+                    if($performance->audience > 20)
+                    {
+                        $thisAmount += 10000 + 500 * ($performance->audience - 20);
+                    }
+                    $thisAmount += 300 * $performance->audience;
+                    break;
+
+                default:
+                    throw new \Error("Unknow type: $play->type");
+            }
+            
+            $volumeCredits += max($performance->audience - 30, 0);
+            if($play->type == 'comedy')
+            {
+                $volumeCredits += floor($performance->audience / 5);
+            }
+            $thisFinalAmount = $thisAmount / 100;
+            $result = "$play->name: $thisFinalAmount ($performance->audience seats)\n";
+            $totalAmount += $thisAmount;
+        }
+
+        $finalTotal = ($totalAmount / 100);
+        $result .= "Amount owed is $finalTotal\n";
+        $result .= "You earned $volumeCredits credits\n";
+        return $result;
+
+
+    }
+}