php
$a1="206,206,206,201,206,201";
//$array = explode(',', $a1); //字符串组成数组
$array1=implode(",",array_unique...(explode(',', $a1)));
print_r($array1);
?...// 示例 1 $pizza = "piece1 piece2 piece3 piece4 piece5 piece6";
$pieces = explode(" ", $pizza);
echo...$pieces[0]; // piece1
echo $pieces[1]; // piece2
implode() 函数把数组元素组合为一个字符串。...结果就是:1-2-3-4;