Function Names
function existing, user function existingSynopsis
... function existing ( function name )Description
Checks if the procedure function is existing. user function existing returns true only if the specified function name refers to an existing user procedure or function.
Call as: function
Restrictions
Indirect parameter passing is disabled
Parameter count
1
Parameters
| No. | Type | Description |
|---|---|---|
| 1 input |
string | Name of existing user function Any string can be specified here |
Return value
| Type | Description |
|---|---|
| boolean | returned value true if procedure or function (or user procedure or function) is existing |
Examples
define procedure (foo) { echo( Fool ); };
echo("Test if existing:");
echo(" foo : ", function existing( foo )); // user defined
echo(" bar : ", function existing( bar )); // not existing
echo(" abs : ", function existing( abs )); // existing
echo(new line, "Test if user function:");
echo(" foo : ", user function existing( foo )); // user defined
echo(" bar : ", user function existing( bar )); // not existing
echo(" abs : ", user function existing( abs )); // existingOutput
Test if existing:
foo : true
bar : false
abs : true
Test if user function:
foo : true
bar : false
abs : false