ctype_digit
Description
Check for numeric character(s)
Syntax
ctype_digit ( 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 the string text is a decimal digit, FALSE otherwise.
Examples
1
<? $text = "0123456789"; $return = ctype_digit($text); var_export($return); ?>
true
2
<?
for ($i = 0; $i <= 255; ++$i)
{
$return = ctype_digit($i);
if ($return)
{
$character = chr($i);
echo "$i: $character\n";
}
}
?>48: 0 49: 1 50: 2 51: 3 52: 4 53: 5 54: 6 55: 7 56: 8 57: 9
