Online PHP editor | output for l6N9I

@ 2023-08-31T15:32:29Z

<?php
gc_enable();
$arr = [];
getMemory();
for ($i = 0; $i < 5000; $i++) {
    $d = str_repeat("Hello, world!", 400);
    $arr[$i][] = $d;
}

// Clear the sub-arrays
foreach (array_keys($arr) as $index) {
    unset($arr[$index]);
}

// Clear the sub-arrays
foreach ($arr as &$subArray) {
    unset($subArray);
}

array_splice($arr, 0); // Remove all elements from the main array
unset($arr);
gc_collect_cycles();
getMemory();

function getMemory() {
    echo date("Y-m-d H:i:s") . ' :: ' . round(
            (memory_get_usage(true) / 1000000),
            2
        ) . PHP_EOL;
}

Output for 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.1: 2023-09-03 18:52:00 :: 2.1 2023-09-03 18:52:00 :: 44.04
Output for 8.1.2 - 8.1.23: 2023-09-03 18:52:00 :: 2.1 Fatal error: Out of memory (allocated 31457280) (tried to allocate 20480 bytes) in /in/l6N9I on line 7 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.2.0 - 8.2.10: 2023-09-03 18:52:00 :: 2.1 Fatal error: Out of memory (allocated 31457280 bytes) (tried to allocate 8192 bytes) in /in/l6N9I on line 6 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.

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