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@ 2020-04-07T07:06:51Z

<?php

$line = '';
$number = 5;
for ($i = 1; $i <= $number; $i++) {
    $line = str_repeat('*', $i) . $line . '0';
    echo $line . PHP_EOL;
}

Output
Performance
VLD
References
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str_repeat: documentation ( source)

preferences:dark modelive preview

62.13 ms | 402 KiB | 5 Q