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Introduction to the difference between digital detection is_numeric and ctype_digit in PHP_PHP Tutorial
- WBOYOriginal
- 2016-07-21 15:15:34858browse
is_numeric: Check whether it is a numeric string, it can be negative numbers and decimals
ctype_digit: Check whether the characters in the string are all numbers, negative numbers and decimals will fail the test
Note, the parameters must be certain If it is a string, if it is not a string, 0/FASLE will be returned
The following is a test example:
Copy code Code As follows:
$a = 0001111222;
var_dump($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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