ctype_digit

说明(参数 返回值)

范例

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

ctype_digit()

<?php

$strings = array('1820.20', '10002', 'wsl!12');

foreach ($strings as $testcase) {

if (ctype_digit($testcase)) {

echo "The string $testcase consists of all digits.\";

} else {

echo "The string $testcase does not consist of all digits.\";

}

}

?> 上例将输出：

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