Datatype functions
The following datatype and variable functions are supported. See also chapter Datatypes.
| Function/Arguments | Return | Description |
|---|---|---|
| isset (mixed &var1...) | bool | Return true if one or more variables var are defined and not null. isset() is also usable for array keys. For example isset(myArray['key']) will return true if array key with name 'key' hold a value that is not null. |
| unset (mixed &var1...) | true | Unset/Remove one or more variables var. After operation the variables are undefined. unset() is also usable for array keys. For example unset(myArray['key']) will remove the entry with name 'key'. Everytime true is returned. |
| empty (mixed arg) | bool | Return true if arg is empty. Examples for empty values: "",0, false, array(), null - In difference to isset() and PHP it will not work for undefined variables but work for not existing array keys. If variable is not defined empty() will abort the program with error. |
| gettype (mixed arg) | string | Get the name of the datatype of given argument arg. Possible return values are: number, string, boolean, array, handle, null |
| is_array (mixed arg) | bool | Return true if arg is an array. |
| intval (mixed arg) | number | Convert arg to integer number. |
| doubleval (mixed arg) | number | Convert arg to floating point double number. |
| strval (mixed arg) | string | Convert arg to string. |
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