explode(separator,string,limit)
<?php
$str = "are,you,ok";
print_r (explode(",",$str));
?>
Array ( [0] => are [1] => you [2] => ok )
<?php
$str = "are,you,ok";
print_r (explode(",",$str,2));
?>
Array ( [0] => are [1] => you,ok )
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