Question

I need to pad the integer part with 0, the integer part must be at least 2 characters

str_pad( 2    ,2,"0",STR_PAD_LEFT);// 02 -> works
str_pad( 22   ,2,"0",STR_PAD_LEFT);// 22 -> works
str_pad( 222  ,2,"0",STR_PAD_LEFT);// 222-> works
str_pad( 2.   ,2,"0",STR_PAD_LEFT);// 2. -> fails -> 02. or 02
str_pad( 2.11 ,2,"0",STR_PAD_LEFT);// 2.11-> fails -> 02.11

Is there simple code for that?

If possible the same in Java please

double x=2.11;
String.format("%02d%s", (int) x, String.valueOf(x-(int) x).substring(1))

is not only ugly but prints 02.10999999999999988

edit for Java: Java integer part padding

Answer 1

You can also use printf() functions to pad the integer :

Something like (codepad):

<?php

function pad($n) {
    $n = explode('.', (string)$n);

    if (2 === count($n)) {
        return sprintf("%02d.%d\n", $n[0], $n[1]);    
    }

    return sprintf("%02d\n", $n[0]);    
}

foreach (array(2, 22, 222, 2., 2.11) as $num) {
    echo pad($num);
}

// returns 02, 22, 222, 02, 02.11