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function strlen ($str)
{
if ($str == '' ) return 0;
$count = 0;
while (1){
if ( $str[$count] != NULL){
$count++;
continue;
}else{
break;
}
}
return $count;
}
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function substr($str, $start, $length=NULL)
{
if ($str== '' || $start>strlen($str )) return;
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