Php variable type program code explanation

String gettype (mixed $ var) returns the PHP variable type var.

Example

The code is as follows:

Copy code

<? Php Function get_type ($ var) { If (is_object ($ var )) Return get_class ($ var ); If (is_null ($ var )) Return 'null '; If (is_string ($ var )) Return 'string '; If (is_array ($ var )) Return 'array '; If (is_int ($ var )) Return 'integer '; If (is_bool ($ var )) Return 'boolean '; If (is_float ($ var )) Return 'float '; If (is_resource ($ var )) Return 'resource '; // Throw new NotImplementedException (); Return 'unknown '; } ?>

The official saying: do not use gettype () to test a type, because the returned string may need to be changed in future versions. In addition

Compared with the string, it runs slowly.

Use the is _ * function instead.

The code is as follows:

Copy code

<? Php /** * Returns the type of the var passed.      * * @ Param mixed $ var Variable * @ Return string Type of variable */ Function myGetType ($ var)     { If (is_array ($ var) return "array "; If (is_bool ($ var) return "boolean "; If (is_float ($ var) return "float "; If (is_int ($ var) return "integer "; If (is_null ($ var) return "NULL "; If (is_numeric ($ var) return "numeric "; If (is_object ($ var) return "object "; If (is_resource ($ var) return "resource "; If (is_string ($ var) return "string "; Return "unknown type ";     } ?>

Other variable types

Array_key_exists (mixed key, array search): // check whether the given key name or index exists in the array to determine the data type

Is_numeric (mixed var): // checks whether the measurement variable is a digital or digital string.

Is_bool ($ var): // checks whether the measurement variable is Boolean.

Is_float ($ var): // checks whether the variables are float and is_double, and is_real ().

Is_int ($ var): // checks whether the measurement variable is in the same usage as is_integer ().

Is_string ($ var): // checks whether the variable is a string.

Is_object ($ var): // checks whether the measurement variable is an object.

Is_array ($ var): // checks whether the measurement variable is an array.

Is_null ($ var): // checks whether the measurement variable is null.