Home >Backend Development >PHP Tutorial >PHP中数字检测is_numeric与ctype_digit的区别介绍_PHP

PHP中数字检测is_numeric与ctype_digit的区别介绍_PHP

WBOY
WBOYOriginal
2016-06-01 12:08:501181browse

is_numeric:检测是否为数字字符串,可为负数和小数

ctype_digit:检测字符串中的字符是否都是数字,负数和小数会检测不通过

注意,参数一定要是字符串,如果不是字符串,则会返回0/FASLE

下面是测试例子:

复制代码 代码如下:
$a = 0001111222 ;
var_dump($a);
var_dump(is_numeric($a)); //true
var_dump(ctype_digit($a)); //true
$a = 0.1 ;
var_dump($a);
var_dump(is_numeric($a)); //true
var_dump(ctype_digit($a)); //false

$a = -1 ;
var_dump($a);
var_dump(is_numeric($a)); //true
var_dump(ctype_digit($a)); //false

$a = a ;
var_dump($a);
var_dump(is_numeric($a)); //false
var_dump(ctype_digit($a)); //false

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn