Има два варианта:


$colours = array('red', 'green', 'blue');

$clauses = explode(',', 'color=\''.join('\',color=\'', $colours).'\'');


или

function build_clauses($n) {

  return "color='$n'";

}



$clauses = array_map("build_clauses", $colours);

foreach ($colours as $v) {

  $clauses[] = "color='$v'";

}