Added php project and its unit tests.

.gitignore

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+*~
+.\#*
+\#*\#
+.*.~undo-tree~
+
+# Created by https://www.toptal.com/developers/gitignore/api/phpunit
+# Edit at https://www.toptal.com/developers/gitignore?templates=phpunit
+
+### PHPUnit ###
+# Covers PHPUnit
+# Reference: https://phpunit.de/
+
+# Generated files
+.phpunit.result.cache
+.phpunit.cache
+
+# PHPUnit
+/app/phpunit.xml
+/phpunit.xml
+
+# Build data
+/build/
+
+# End of https://www.toptal.com/developers/gitignore/api/phpunit

README.org

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+* php-template
+It is a simple project that uses php, unit test and CI/CD.

composer.json

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+{
+    "require-dev": {
+        "phpunit/phpunit": "^9.5"
+    }
+}
+

shell.nix

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+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell {
+  name = "MyPHPShell";
+  buildInputs = with pkgs; [
+    php80
+    php80Packages.composer
+  ];
+
+  shellHook = ''
+      echo "Welcome to my php8 shell";
+  '';
+}

src/Simple.php

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+<?php
+
+class Simple
+{
+    public function add($a, $b)
+    {
+        return $a + $b;
+    }
+
+    public function subtract($a, $b)
+    {
+        return $a - $b;
+    }
+}
+
+?>

tests/SimpleTest.php

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+<?php
+
+require_once 'src/Simple.php';
+
+use PHPUnit\Framework\TestCase;
+
+class SimpleTest extends TestCase
+{
+    public function testAdd()
+    {
+        $simple = new Simple();
+        $result = $simple->add(2, 3);
+        $this->assertEquals(5, $result);
+    }
+
+    public function testSubtract()
+    {
+        $simple = new Simple();
+        $result = $simple->subtract(3, 2);
+        $this->assertEquals(1, $result);
+    }
+}
+
+?>