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@ 2021-03-16T08:44:35Z

<?php

for ($i = -1; $i < 2; $i++) {
    for ($j = -1; $j < 2; $j++) {
        echo sprintf("%2d <=> %2d: %2d" . PHP_EOL, $i, $j, $i <=> $j);
    }
}

Output
Performance
VLD
References
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sprintf: documentation ( source)

preferences:dark modelive preview

55.63 ms | 402 KiB | 5 Q