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<?php $test = array(); $test[0]; $test_count = count($test[0]); echo $test_count; ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 0 in /in/A7B0Y on line 3 Warning: Undefined array key 0 in /in/A7B0Y on line 4 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /in/A7B0Y:4 Stack trace: #0 {main} thrown in /in/A7B0Y on line 4
Process exited with code 255.

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