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@ 2015-03-27T12:35:22Z

<?php

for( $i = 1; $i < 20; $i++ ) {
    echo 1 * ( 1 * $i + pow( -1, $i ) - 1 ) . ', ';
}

Output
Performance
VLD
References
Branches

pow: documentation ( source)

preferences:dark modelive preview

45.2 ms | 402 KiB | 5 Q