1.字符串转化为数组:explode()
$label = "张三,李四,王五,赵六";
$labelArray = explode(",",$label);// ","为分隔符,$label为要操作的变量
$labelArray就是我们需要的数组
2.数组转化为字符串:implode()
$labelArray=['张三','李四','王五'];
$label = implode(",",$labelArray);
$label 就是转化成功后的字符串
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