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@ 2017-07-13T17:29:47Z

<?php

$value = '3.5';
if ($value != '') {
    $css_class = substr($value, 0, 1) . substr($value, 2, 1);
}

echo $css_class;

Output
Performance
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substr: documentation ( source)

preferences:dark modelive preview

38.06 ms | 402 KiB | 5 Q