Input: 1234567 Output: 01234567 Input: 1234 Output: 00001234There are many ways to pad leading zeros in string format. But in the case of a string, the best way to solve the problem is - use the function sprintf, and also use the function substr() .
- function sprintf()
- substr() functin
Syntax:
sprintf (format, $variable) // Returns the variable formated according to the format provided.
- Example 1:This example uses the sprintf() function to display a number with leading zeros.
$var= 1234567;echosprintf (’% 08d’,$var);?>01234567
- Example 2: Inthis example uses the sprintf() function to display negative numbers with leading zeros.
$var1= -10;$var2= 10;echosprintf (’% 04s’,$var1)."";echosprintf (’% 04s’,$var2);?>0-10 0010
In the above example, we tried to format the number as a string and messed up the negative. But this will not happen if we format the numbers using "% d" rather than "% s". - Example 3:
$var1= -10;$var2= 10;echosprintf (’% 04d’,$var1)."";echosprintf (’% 04d’,$var2);?>-010 0010
Syntax:
substr (string $string, int $start, int $length) // Returns the portion of string that define at start and length of the parameter ...Example :
$num = 123; $str_length = 4;
// Left padding if number < $str_length $str = substr ( "0000 {$num}" , - $str_length ); echo sprintf ( $str ); ?> Output:0123
