Differences between is_numeric and ctype_digit in PHP _ PHP Tutorial

Differences between is_numeric and ctype_digit in PHP. Is_numeric: Check whether the string is a numeric string. if it can be a negative number or a decimal number, ctype_digit: check whether all characters in the string are numbers. if it is a negative number or a decimal number, check whether the parameter is is_numeric: checks whether it is a numeric string, which can be a negative number or a decimal number.

Ctype_digit: checks whether all characters in a string are numbers. negative and decimal digits cannot be detected.

Note that the parameter must be a string. if it is not a string, 0/FASLE is returned.

The following is a test example:

The code is as follows:

$ A = 0001111222;
Var_dump ($ );
Var_dump (is_numeric ($ a); // true
Var_dump (ctype_digit ($ a); // true
$ A = 0.1;
Var_dump ($ );
Var_dump (is_numeric ($ a); // true
Var_dump (ctype_digit ($ a); // false

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

$ A =;
Var_dump ($ );
Var_dump (is_numeric ($ a); // false
Var_dump (ctype_digit ($ a); // false

Ctype_digit: checks whether all characters in a string are numbers. negative numbers and decimals cannot be detected. the parameter must be...