Add PHP 7.4 demo for Jenkins

README.md

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+# php-demo
+
+PHP **7.4** demo for Gitea + Jenkins on this server.
+
+```bash
+/www/server/php/74/bin/php -l src/Hello.php
+/www/server/php/74/bin/php tests/hello_test.php
+```

composer.json

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+{
+  "name": "ci/php-demo",
+  "description": "Tiny PHP 7.4 demo built by Jenkins",
+  "require": {
+    "php": ">=7.4 <8.0"
+  },
+  "autoload": {
+    "psr-4": {
+      "Demo\\": "src/"
+    }
+  }
+}

src/Hello.php

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+<?php
+declare(strict_types=1);
+
+namespace Demo;
+
+final class Hello
+{
+    public static function greet(string $name): string
+    {
+        $name = trim($name);
+        if ($name === '') {
+            $name = 'World';
+        }
+        return 'Hello, ' . $name;
+    }
+}

tests/hello_test.php

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+<?php
+declare(strict_types=1);
+
+require __DIR__ . '/../src/Hello.php';
+
+use Demo\Hello;
+
+$got = Hello::greet('Gitea');
+if ($got !== 'Hello, Gitea') {
+    fwrite(STDERR, "FAIL greet: {$got}\n");
+    exit(1);
+}
+$got = Hello::greet('  ');
+if ($got !== 'Hello, World') {
+    fwrite(STDERR, "FAIL empty: {$got}\n");
+    exit(1);
+}
+echo "PHP 7.4 tests OK\n";