Check for uppercase character(s)
Syntax
ctype_upper ( mixed $text ) : bool
Parameters
textThe tested string.
Note: If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.
Return
Returns TRUE if every character in text is an uppercase letter in the current locale.
Examples
1
<? $text = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; $return = ctype_upper($text); var_export($return); ?>
true
2
<?
for ($i = 0; $i <= 255; ++$i)
{
$return = ctype_upper($i);
if ($return)
{
$character = chr($i);
echo "$i: $character\n";
}
}
?>65: A 66: B 67: C 68: D 69: E 70: F 71: G 72: H 73: I 74: J 75: K 76: L 77: M 78: N 79: O 80: P 81: Q 82: R 83: S 84: T 85: U 86: V 87: W 88: X 89: Y 90: Z
