feat(php): add PHP catalog with PPA and update Composer dependency

- Add catalog/php.json with:
  - package_manager install method
  - ondrej/php PPA for latest PHP on Ubuntu/Debian
  - Support for apt, brew, dnf, pacman
  - Guide order 250 (before Composer)
- Update catalog/composer.json:
  - Add "requires": ["php"] field
  - Add guide section with order 260
- Update install_composer.sh:
  - Check for PHP before installation
  - Auto-install PHP if missing via package_manager.sh
  - Provide manual installation instructions on failure

Author: CybotTM

catalog/composer.json

@@ -7,5 +7,11 @@
   "github_repo": "composer/composer",
   "binary_name": "composer",
   "script": "install_composer.sh",
+  "requires": ["php"],
+  "guide": {
+    "display_name": "Composer",
+    "install_action": "install",
+    "order": 260
+  },
   "notes": "Installed from latest stable phar (https://getcomposer.org/download/latest-stable/composer.phar). Requires PHP."
 }

catalog/php.json

@@ -0,0 +1,23 @@
+{
+  "name": "php",
+  "category": "php",
+  "install_method": "package_manager",
+  "description": "PHP programming language",
+  "homepage": "https://www.php.net",
+  "github_repo": "php/php-src",
+  "binary_name": "php",
+  "ppa": "ondrej/php",
+  "packages": {
+    "apt": "php php-cli php-mbstring php-xml php-curl php-zip",
+    "brew": "php",
+    "dnf": "php php-cli php-mbstring php-xml",
+    "pacman": "php"
+  },
+  "version_flag": "--version",
+  "guide": {
+    "display_name": "PHP",
+    "install_action": "install",
+    "order": 250
+  },
+  "notes": "Uses ondrej/php PPA for latest PHP version on Ubuntu/Debian. Required for Composer."
+}

scripts/install_composer.sh

@@ -3,9 +3,33 @@
 # Downloads latest stable composer.phar and installs to /usr/local/bin
 set -euo pipefail
 
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
 INSTALL_DIR="${COMPOSER_INSTALL_DIR:-/usr/local/bin}"
 COMPOSER_URL="https://getcomposer.org/download/latest-stable/composer.phar"
 
+# Check for PHP dependency
+if ! command -v php >/dev/null 2>&1; then
+  echo "[composer] Error: PHP is required but not installed." >&2
+  echo "[composer] Install PHP first using one of:" >&2
+  echo "           - sudo apt-get install php php-cli  (Debian/Ubuntu)" >&2
+  echo "           - brew install php                   (macOS)" >&2
+  echo "           - ./install_tool.sh php              (via this toolset)" >&2
+
+  # Try to install PHP automatically if we can
+  if [ -f "$DIR/installers/package_manager.sh" ]; then
+    echo "[composer] Attempting to install PHP automatically..." >&2
+    if "$DIR/installers/package_manager.sh" php; then
+      echo "[composer] PHP installed successfully, continuing with Composer..." >&2
+    else
+      echo "[composer] Failed to install PHP automatically. Please install manually." >&2
+      exit 1
+    fi
+  else
+    exit 1
+  fi
+fi
+
 echo "[composer] Downloading latest stable composer.phar..."
 
 # Download to temp file