button rand
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<?php
$buttons = [];
$buttons[] = '<button type="button" id="a" class="btn btn-primary">Primary</button>';
$buttons[] = '<button type="button" id="b" class="btn btn-danger">danger</button>';
$buttons[] = '<button type="button" id="c" class="btn btn-warning">warning</button>';
shuffle($buttons);
print_r($buttons);
Php
INFO