ctype_cntrl
ctype_graph
Character Type Functions
PHP Manual

# ctype_digit

(PHP 4 >= 4.0.4, PHP 5)

ctype_digit — Check for numeric character(s)

### Description

bool ctype_digit ( string `$text` )

Checks if all of the characters in the provided string, `text` , are numerical.

### Parameters

`text`

  The tested string.

### Return Values

Returns `TRUE` if every character in `text` is a decimal digit, `FALSE` otherwise.

### Examples

Example#1 A ctype_digit() example

`<?php
$strings = array('1820.20', '10002', 'wsl!12');
foreach ($strings as $testcase) {
if (ctype_digit($testcase)) {
echo "The string $testcase consists of all digits.\n";
} else {
echo "The string $testcase does not consist of all digits.\n";
}
}
?>`

The above example will output:

    The string 1820.20 does not consist of all digits.
    The string 10002 consists of all digits.
    The string wsl!12 does not consist of all digits.

### See Also

- ctype_alnum()
- ctype_xdigit()

ctype_cntrl
ctype_graph
Character Type Functions
PHP Manual