Add PHP version of kata

php/.gitignore

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+vendor/

php/README.md

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+Theatrical Players Refactoring Kata - PHP version
+========================================================
+
+See the [top level readme](https://github.com/emilybache/Theatrical-Players-Refactoring-Kata) for general information about this exercise.
+
+This project uses [PHPUnit](https://github.com/sebastianbergmann/phpunit) and [approvaltests](https://github.com/approvals/ApprovalTests.php). 
+
+Run ```composer install``` then ```./vendor/phpunit tests/StatementPrinterTest.php``` to run the tests
+

php/composer.json

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+{
+    "name": "sam/theatrical",
+    "type": "project",
+    "require-dev": {
+        "phpunit/phpunit": "^9",
+        "approvals/approval-tests": "^1.4"
+    },
+    "authors": [
+        {
+            "name": "Sam Cranford",
+            "email": "sam@cranford.fr"
+        }
+    ],
+    "require": {},
+    "autoload": {
+        "psr-4": {
+            "Theatrical\\": "src/"
+        }
+}
+}

php/index.php

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+
+<?php
+        
+require __DIR__ . '/vendor/autoload.php';

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;
+
+
+    }
+}

php/tests/StatementPrinterTest.php

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+<?php
+
+use PHPUnit\Framework\TestCase;
+use ApprovalTests\Approvals;
+
+use Theatrical\StatementPrinter;
+use Theatrical\Play;
+use Theatrical\Performance;
+use Theatrical\Invoice;
+
+final class StatementPrinterTest extends TestCase
+{
+    public function testListOfPlayIsCorrect() : void 
+    {
+        $plays = [
+            "hamlet" => new Play("Hamlet", "tragedy"),
+            "as-like" => new Play("As You Like It", "comedy"),
+            "othello" => new Play("Othello", "tragedy")
+        ];
+
+        Approvals::approveList($plays);    
+    }
+
+    public function testCanPrintInvoice() : void 
+    {
+        $plays = [
+            "hamlet" => new Play("Hamlet", "tragedy"),
+            "as-like" => new Play("As You Like It", "comedy"),
+            "othello" => new Play("Othello", "tragedy")
+        ];
+
+        $performances = [
+            new Performance("hamlet", 55),
+            new Performance("as-like", 35),
+            new Performance("othello", 40)
+        ];
+        $invoice = new Invoice("BigCo", $performances);
+        $statementPrinter = new StatementPrinter();
+        $result = $statementPrinter->print($invoice, $plays);
+
+        Approvals::approveString($result);  
+    }
+
+    public function testNewPlayTypes() : void 
+    {
+        $plays = [
+            "henry-v" => new Play("Henry V", "history"),
+            "as-like" => new Play("As You Like It", "comedy"),
+        ];
+
+        $performances = [
+            new Performance("henry-v", 53),
+            new Performance("as-like", 55)
+        ];
+
+        $invoice = new Invoice("BigCo", $performances);
+        $statementPrinter = new StatementPrinter();
+        $this->expectException(\Error::class);
+        $statementPrinter->print($invoice, $plays);
+    }
+}

php/tests/approvals/StatementPrinterTest.testCanPrintInvoice.approved.txt

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+Othello: 500 (40 seats)
+Amount owed is 1730
+You earned 47 credits