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Variable handling Functions

boolval debug_zval_dump doubleval floatval get_debug_type get_defined_vars get_resource_id get_resource_type gettype intval is_array is_bool is_callable is_countable is_double is_float is_int is_integer is_iterable is_long is_null is_numeric is_object is_resource is_scalar is_string print_r serialize settype strval unserialize var_dump var_export

is_callable

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Supported Versions: PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8
Verify that a value can be called as a function from the current scope.
<?php is_callable(mixed $value, bool $syntax_only = false, string &$callable_name = null): bool