Mobile Validation in PHP website Form Submission

Hello Friends,

I have a PHP website. In this website there is one inquire form. In this form i'm add insert your mobile number section. in this section user only fill numeric value not any alphabetic character. if user can press any alphabetic character it dose't insert in this section.

So, i want your help and get PHP CODE for this type of Mobile Validation CODE.

Thanks,
-MO
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