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

Jun 01, 2016 pm 12:08 PM

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

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