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.

参见

ctype_alnum()
ctype_xdigit()


	PHP5中文手册 ctype_cntrl ctype_graph ctype PHP Manual 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. 参见 ctype_alnum() ctype_xdigit() ctype_cntrl ctype_graph ctype PHP Manual