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error checking


fife

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can somebody please tel me how to make sure a field is a number?  I have some error checking like

 

if(empty($postcode))    {        
$errors[] = "Please enter your postcode"; 
}
if(strlen($tel)<11)    {        
$errors[] = "Please enter a phone number that is the correct length";    
} 

 

But I dont know and cant find how to check for a number only.

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