Aqui teneis un ejemplo para ver que funciona correctamente.
Saludos ¡¡¡
Código PHP:
<?php
$cadena1="100001";
$cadena2="1200002";
$cadena3="14900003";
$cadena4="128300004";
$cadena5="7366200005";
$cadena1a = substr ($cadena1,0,-5);
$cadena1b = substr ($cadena1,-5);
$cadena2a = substr ($cadena2,0,-5);
$cadena2b = substr ($cadena2,-5);
$cadena3a = substr ($cadena3,0,-5);
$cadena3b = substr ($cadena3,-5);
$cadena4a = substr ($cadena4,0,-5);
$cadena4b = substr ($cadena4,-5);
$cadena5a = substr ($cadena5,0,-5);
$cadena5b = substr ($cadena5,-5);
echo $cadena1a; echo "|"; echo $cadena1b;
echo "<br/><br/>";
echo $cadena2a; echo "|"; echo $cadena2b;
echo "<br/><br/>";
echo $cadena3a; echo "|"; echo $cadena3b;
echo "<br/><br/>";
echo $cadena4a; echo "|"; echo $cadena4b;
echo "<br/><br/>";
echo $cadena5a; echo "|"; echo $cadena5b;
echo "<br/><br/>";
?>