PHP

php add 0 before number

$number = 4;
str_pad($number, 2, '0', STR_PAD_LEFT); // returns 04

$number = 14;
str_pad($number, 2, '0', STR_PAD_LEFT); // returns 14

add leading zeros in php

$number = 4;
echo(str_pad($number, 2, '0', STR_PAD_LEFT)); // returns 04

$number = 14;
echo(str_pad($number, 2, '0', STR_PAD_LEFT)); // returns 14

format a number with leading zeros in php

sprintf('%06d', '12')