PHP References related issues

PHP Reference issues
I reference the function cut () of B file in a file, write include_once ("b.php") on page A, and then call But I don't know why I always run an error fatal Error:call to undefined function cut () in D:\XAMPP1.7.3\xampp\htdocs\web\index.php on line 233
Does this mean that there is no cut function defined? But I clearly defined it. Then look at the page a source file, the part that should show the result is my cut function code.
The Cut function is function Cut ($STR, $Length) {//$STR to intercept the string, $Length the length to intercept

Global $s;
$i = 0;
$l = 0;
$ll = strlen ($STR);
$s = $Str;
$f = true;

while ($i <= $ll) {
if (Ord ($Str {$i}) < 0x80) {
$l + +; $i + +;
} else if (Ord ($Str {$i}) < 0xe0) {
$l + +; $i + = 2;
} else if (Ord ($Str {$i}) < 0xf0) {
$l + = 2; $i + = 3;
} else if (Ord ($Str {$i}) < 0xf8) {
$l + = 1; $i + = 4;
} else if (Ord ($Str {$i}) < 0XFC) {
$l + = 1; $i + = 5;
} else if (Ord ($Str {$i}) < 0xFE) {
$l + = 1; $i + = 6;
}

if (($l >= $Length-1) && $f) {
$s = substr ($Str, 0, $i);
$f = false;
}

if (($l > $Length) && ($i < $ll)) {
$s = $s. '...'; Break If intercepted, the end of the string is appended with the ellipsis "..."
}
}
return $s;
}
?>

I do not know that I express clearly no, I hope someone can help answer.

------Solution--------------------
Have you opened the PHP break tag, your a file's PHP tag should be ------Solution--------------------
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Have you opened the PHP break tag, your a file's PHP tag should be

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