php - 屏蔽电话号码，无论长度如何

Question

I've tried the following functions

str_repeat("*", strlen($value['number'])-2) . substr($value['number'], -2)

and str_pad(substr($value['number'], -2), strlen($value['number']), '*', STR_PAD_LEFT)

However they both yield the same result: ******43

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What I am tying to achieve is this: 70****43, but dynamically regardless of number length.

Any suggestions how it can be done?

Answer 1

See below:

$num = '70564843';

echo substr( $num, 0, 2 ) // Get the first two digits
     .str_repeat( '*', ( strlen( $num ) - 4 ) ) // Apply enough asterisks to cover the middle numbers
     .substr( $num, -2 ); // Get the last two digits

Output:

70****43