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<?php
/*
This function tests to make sure a string is _really_ non-null. It
accepts one argument:
$string - the string to be tested
It returns true if the string is really a null string, and false
otherwise.
*/
function isBlank ($string) {
if ($string == "") return true;
for ($i = 0; $i < strlen($string); $i++) {
$c = substr($string, $i, 1);
if (($c != "r") && ($c != " ") && ($c != "n") && ($c != "t")) {
return false;
}
}
return true;
}
?>
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Usage Example
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$string = " n"
if (isBlank($string)) {
echo "Blank!n";
else {
echo "Validn";
}
/* Result:
Blank!
*/
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