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<?php function test_position($input) { $_POST['position'] = $input; // Original code $original = ( isset( $_POST['position'] ) && (int) $_POST['position'] ) ? (int) $_POST['position'] : '-1'; // Alternative 1: !empty() $empty_check = ! empty( $_POST['position'] ) ? (int) $_POST['position'] : -1; // Alternative 3: null coalescing operator $null_coalesce = (int) ($_POST['position'] ?? '-1'); echo "Input: $input\n"; echo "Original: $original\n"; echo "!empty() check: $empty_check\n"; echo "Null coalescing: $null_coalesce\n"; echo "-------------------------\n"; } // Test cases $test_inputs = ['5', '0', 'xyz', '', null]; foreach ($test_inputs as $input) { test_position($input); } ?>