If you have a number X and you need to have it like 0000X you can use str_pad() or printf().
If you have the number 55, for exmaple, and you want it to look like 000055 do :
<?php
$Num = 55 ;
print str_pad ( $Num , 6 , "0" , STR_PAD_LEFT );
?>
This will print 000055
You can also do this :
<?php
$Num = 55 ;
printf ( "%06d" , $Num );
?>
This will also print 000055
String Replacement and speed consideration
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