PHP Form Spam Prevention

Job ID: 32354842

Budget: ₹600 – ₹750 INR

Hi,
I have a php landing page with 4 fields,
Name, Email, Phone Number & Your message. I have well validated the fields. Still the spam comes through it.

sometimes there's a blank form entries & sometimes regular spam with fake email, bad url's in message area. I just wanted to prevent this Spam without using captcha or using any hidden field, or preventing url's in textarea whichver better
Related categories: PHP JavaScript HTML jQuery