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ctype_digit

Description

The ctype_digit of Ctype for PHP checks for numeric character(s).

Syntax

ctype_digit(
    mixed $text
): bool

Parameters

text

The 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.

When called with an empty string the result will always be false.

Examples

1 · text · empty

<?

$text = "";

$return = ctype_digit($text);

var_export($return);

false

2 · text · numeric

<?

$text = "0123456789";

$return = ctype_digit($text);

var_export($return);

true

3 · text · integer

<?

for($i = -128; $i <= 255; ++$i)
{
    $return = ctype_digit($i);

    if($return)
    {
        echo "$i: ". chr($i). PHP_EOL;
    }
}

48: 0
49: 1
50: 2
51: 3
52: 4
53: 5
54: 6
55: 7
56: 8
57: 9