What does it mean when *RECURSION* is listed in the output of a print_r function in PHP?

When *RECURSION* is listed in the output of a print_r function in PHP, it means that there is a circular reference in the data structure being printed. This can cause the print_r function to enter an infinite loop, resulting in the *RECURSION* message. To solve this issue, you can use the xdebug library to increase the recursion limit or manually handle the circular reference in your data structure. 

// Increase recursion limit using xdebug
ini_set('xdebug.max_nesting_level', 200);

// Your code here
print_r($your_data_structure);

Keywords

recursion print_r PHP output function

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