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@ 2019-11-18T07:31:29Z

<?php

$sample = array('a.col1','a.col2','b.col1','c.col1','c.col2','d.col5');

foreach ($sample as $column) {
    ${strstr($column, '.', true)}[] = $column;
}

var_export($a);
var_export($b);
var_export($c);
var_export($d);

Output
Performance
VLD
References
Branches

strstr: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

27.25 ms | 405 KiB | 5 Q