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PHP Authentication Code for Subscriber Call Codes (STDs) in India

I did a lot of google to get the PHP verification code to check the available STD codes in India, but could not get it. If anyone has an STD verification code, please help me with this. Thank you in advance. I

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Prepare your own verification code.

Make a list of all available codes and save them in an array ... Now check the entered code with in_array()

 <?php $os = array("079", "040", "0891"); if (in_array($_POST['std'], $os)) { echo "Valid"; } else { echo "Enter a valid code"; }
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You must collect and store std codes in the database and need to be checked by the server ... Encodings are the same as regular e-mail, there is a check ... :)

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