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Fatal error: Uncaught TypeError: array_shift(): Argument #1 ($array) must be of type array, null given in /home3/banklive/public_html/vendor/marcusschwarz/lesserphp/tests/sort.php:8 Stack trace: #0 /home3/banklive/public_html/vendor/marcusschwarz/lesserphp/tests/sort.php(8): array_shift(NULL) #1 {main} thrown in /home3/banklive/public_html/vendor/marcusschwarz/lesserphp/tests/sort.php on line 8