Useful predefined PHP functions

print_r(get_defined_vars());

get_defined_vars — Returns an array of all defined variables

print_r(get_defined_functions());

get_defined_functions — Returns an array of all defined functions

You should be careful about the location in the code, because if you are inside a function it will work only for this function.

print_r(get_defined_constants());

get_defined_constants – Returns list all defined constants with their respective values

print_r(get_declared_classes());

get_declared_classes – Returns list all declared classes

print_r(memory_get_usage());

memory_get_usage — Returns the amount of memory allocated to PHP

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