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interface_exists()

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<?php
$bool = interface_exists (
     ✓?, // string $interface_name
     ✓?  // [bool $autoload = true]
);
?>
Result
$bool = false
Examples
#1 interface_exists  ("MyInterface")
#2 interface_exists  ("ArrayAccess")
See also
class_exists, class_implements, get_declared_interfaces
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