what is the error: number of pence

[lse123]

what is the error: number of pence

given cents amount $x get number of coins the min can subdivided...

<?php
// File: example9-9.php

$x = 579;
$a200=0;
$a100=0;
$a50=0;
$a20=0;
$a10=0;
$a5=0;
$a2=0;
$a1=0;

$x1=1;
while ($x1<8) {


switch (true) {
case ($x>=200): 
    $a200=$x/200-($x%200)/200;
	break;
case ($x>=100):
    $a100=$x/100-($x%100)/100;
	break;
case ($x>=50):
    $a50=$x/50-($x%50)/50;
	break;
case ($x>=20):
    $a20=$x/20-($x%20)/20;
	break;
case ($x>=10):
    $a10=$x/10-($x%10)/10;
	break;
case ($x>=5):
    $a5=$x/5-($x%5)/5;
	break;	
case ($x>=2):
     $a2=$x/2-($x%2)/2;
     break;
default:
     $a1=$x;
	 break;   
}
	
$x1++ ;

}
echo $a200."x200<br />";
echo $a100."x100<br />";
echo $a50."x50<br />";
echo $a20."x20<br />";
echo $a10."x10<br />";
echo $a5."x5<br />";
echo $a2."x2<br />";
echo $a1."x1<br />"; 
?>

[lse123]

//problem self fixed...

switch (true) {
case ($x>=200): 
    $a200=$x/200-($x%200)/200;
    $x-=$a200*200;
    break;
case ($x>=100):
    $a100=$x/100-($x%100)/100;
    $x-=$a100*100;
    break;
case ($x>=50):
    $a50=$x/50-($x%50)/50;
    $x-=$a50*50;
    break;
case ($x>=20):
    $a20=$x/20-($x%20)/20;
    $x-=$a20*20;
    break;
case ($x>=10):
    $a10=$x/10-($x%10)/10;
    $x-=$a10*10;
    break;
case ($x>=5):
    $a5=$x/5-($x%5)/5;
    $x-=$a5*5;
    break;    
case ($x>=2):
     $a2=$x/2-($x%2)/2;
     $x-=$a2*2;
     break;
default:
     $a1=$x;
     break;   
}