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PHP5中文手册

ctype_digit

(PHP 4 >= 4.0.4, PHP 5)

ctype_digit — Check for numeric character(s)

说明

bool ctype_digit ( string $text )

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

参数

text

The tested string.

返回值

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

范例

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";
    }
}
?>

上例将输出:

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.