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@ 2018-05-31T12:50:04Z

<?php
$border_hover = true;
$classes   = $border_hover ? array( 'has-hover' ) : [];

echo implode( ", ", $classes );

Output
Performance
VLD
References
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implode: documentation ( source)

preferences:dark modelive preview

52.83 ms | 402 KiB | 5 Q