function existing, user function existing
... function existing ( function name )
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.
1
No. | Type | Description |
---|---|---|
1 input |
string | Name of existing user function Any string can be specified here |
Type | Description |
---|---|
boolean | returned value true if procedure or function (or user procedure or function) is existing |
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 )); // existing
Test if existing:
foo : true
bar : false
abs : true
Test if user function:
foo : true
bar : false
abs : false