如何在PHP中格式化数值？

I want format number as style '00000' ex:

$a=1 => $a2="00001"
$b=23 => $b2="00023"

How format number in php?

You should use str_pad : http://www.php.net/manual/fr/function.str-pad.php

$formattedValue = str_pad($value, 6, "0", STR_PAD_LEFT);

sprintf:

$formattedValue = sprintf('%05s', $value);

• 0 is the character to pad 5 times. s specifies that it's a string.

use the str_pad function:- $a2 = str_pad($a, 5, "0", STR_PAD_LEFT);