In the following code, i am starting my apache during the startup.

Create a file /Library/LaunchDaemons/apachefriends.xampp.apache.start.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
    <key>EnableTransactions</key>
    <true/>
    <key>Label</key>
    <string>apachefriends.xampp.apache.start</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Applications/XAMPP/xamppfiles/xampp</string>
        <string>startapache</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/Applications/XAMPP/xamppfiles</string>
    <key>KeepAlive</key>
    <false/>
    <key>AbandonProcessGroup</key>
    <true/>
    </dict>
</plist>