Php numeric, character, object judgment function

// Double-precision data determination

Is_double
Is_double -- is_float () alias
Description
This function is an alias function of is_float.

 

The code is as follows:	Copy code
$ Temperature = 15.23; If (is_double ($ Temperature )) { Print ("Temperature is a double". "<br> "); }

// Integer judgment

Is_integer -- is_int () and is_long () aliases
Description
This function is an alias function of is_int.

 

The code is as follows:	Copy code
$ PageCount = 2234; If (is_integer ($ PageCount )) { Print ("$ PageCount is an integer". "<br> "); }

// Object judgment

Is_object -- check whether the variable is an object
Description
Bool is_object (mixed var)

If var is an object, TRUE is returned; otherwise, FALSE is returned.

 

The code is as follows:	Copy code
Class widget { Var $ name; Var $ length; } $ Thing = new widget; If (is_object ($ thing )) { Print ("thing is an object". "<br> "); }

// Character judgment

Is_string -- check whether the variable is a string
Description
Bool is_string (mixed var)

If var is a string, TRUE is returned; otherwise, FALSE is returned.

 

The code is as follows:	Copy code
$ Greeting = "www.111cn.net "; If (is_string ($ Greeting )) { Print ("Greeting is a string". "<br> "); }

Is_numeric -- checks whether the variable is a numeric or numeric string
Description
Bool is_numeric (mixed var)

Returns TRUE if var is a number or number string; otherwise, returns FALSE.

The code is as follows:	Copy code
$ Int = 1; If (is_numeric ($ int )) { Print ("This is a real number, just man". "<br> "); }

Well, this article briefly describes php Objects, numbers, character judgment functions, and the difficulty is relatively simple.