Likely the same way, PHP has a function list that can uncover the mystery of the list of methods which returns various useful results and works like a magic.
Here is another function available in PHP which can provide the list of the defined functions list in an array format.
get_defined_functions();
It returns an array of all defined functions.
get_defined_functions(bool $exclude_disabled = true): array
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The output of this function with boolean false will look like something similar to:
Array ( [internal] => Array ( [0] => zend_version [1] => func_num_args [2] => func_get_arg [3] => func_get_args [4] => strlen [5] => strcmp [6] => strncmp ... [750] => bcscale [751] => bccomp ) [user] => Array ( [0] => myrow ) )
By the mean of $exclude_disabled boolean in this function:
exclude_disabled
Whether disabled functions should be excluded from the return value.
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