Question

I am studying about printf,sprintf and i didnt understand few points, if can some one please help me understand thos points,

At This Link at PHP Manual:

There are explanations are numbered from one to six:

What i didnt understand is: The First and The Second(1(sign specifier), 2(padding specifier)), if can some one please help me with example for thos i will be very thankful.

Answer 1

The sign specifier forces a sign, even if it’s positive. So, if you have

$x = 10;
$y = -10;
printf("%+d", $x);
printf("%+d", $y);

You’ll get:

+10
-10

The padding specifier adds left padding so that the output always takes a set number of spaces, which allows you to align a stack of numbers, useful when generating reports with totals, etc.

 $x = 1;
 $y = 10;
 $z = 100;
 printf("%3d\n", $x);
 printf("%3d\n", $y);
 printf("%3d\n", $z);

You’ll get:

   1
  10
 100

If you prefix the padding specifier with a zero, the strings will be zero padded instead of space padded:

 $x = 1;
 $y = 10;
 $z = 100;
 printf("%03d\n", $x);
 printf("%03d\n", $y);
 printf("%03d\n", $z);

Gives:

 001
 010
 100