$values = array_map('array_pop', $array); $imploded = implode(',', $values);
<?php $arr = array('Hello','World!','Beautiful','Day!'); echo implode(" ",$arr); ?>
<?php $a = "Hello "; $b = $a . "World!"; // now $b contains "Hello World!" $a = "Hello "; $a .= "World!"; // now $a contains "Hello World!" ?>