Php numeric, character, object judgment function

// Determine the alias of is_doubleis_double -- is_float () by double precision. This function is an alias function of is_float. The code is as follows $ Temperature15.23; if (is_double ($ Temperature) {print (& quot; Temperatureisadouble & quot

// 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:
$ Temperature = 15.23;
If (is_double ($ Temperature ))
{
Print ("Temperature is a double "."
");
}
 
// 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:
$ PageCount = 2234;
If (is_integer ($ PageCount ))
{
Print ("$ PageCount is an integer "."
");
}

// 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:
Class widget
{
Var $ name;
Var $ length;
}
$ Thing = new widget;
If (is_object ($ thing ))
{
Print ("thing is an object "."
");
}
 

// 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:
$ Greeting = "www.hzhuti.com ";
If (is_string ($ Greeting ))
{
Print ("Greeting is a string "."
");
}

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:
$ Int = 1;
If (is_numeric ($ int ))
{
Print ("This is a real number, man "."
");
}
 

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

 

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