Ctype Функции
PHP Manual

ctype_digit

(PHP 4 >= 4.0.4, PHP 5)

ctype_digitCheck for numeric character(s)

Описание

bool ctype_digit ( string $text )

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

Параметри

text

The tested string.

Връщани стойности

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

Дневник на промените

Версия Описание
5.1.0 Before PHP 5.1.0, this function returned TRUE when text was an empty string.

Примери

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";
    }
}
?>

Примерът по-горе ще изведе:

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.

Example #2 A ctype_digit() example comparing strings with integers

<?php

$numeric_string 
'42';
$integer        42;

ctype_digit($numeric_string);  // true
ctype_digit($integer);         // false

is_numeric($numeric_string);   // true
is_numeric($integer);          // true
?>

Бележки

Забележка: This function require a string to be useful, so for example passing in an integer will always return FALSE. However, also note that HTML Forms will result in numeric strings and not integers. See also the types section of the manual.

Вж. също


Ctype Функции
PHP Manual