is_callable

PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8
is_callable - Verify that a value can be called as a function from the current scope.
Manual
Code Examples

Example #1 is_callable example

<?php
// How to check a variable to see if it can be called
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Example #2 is_callable and constructors

Result: bool(false) bool(false)
<?php
class Foo
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Function is_callable:

Variable handling Functions

Most used PHP functions