string - Replace first and last digit with * in php -

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i want replace 1st , last digit of number series *. such have 

$number = 123435987345735372;

i want such 

*535738753957353*

like this?

$number = 123435987345735372;  $new_number = substr($number, 1, -1); $new_number = "*".$new_number."*"; echo"original number: $number<br>new number: $new_number";

like norbert van nobelen said, check out manual @ php.net


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