php 将某个数组里的字符串二次拆分后的某个值再次拼接成字符串

array(3) { [0] => array(4) { ["class_id"] => string(2) "16" ["class_type"] => string(1) "1" ["class_time"] => string(10) "1483545600" ["week_time"] => string(24) "1:12,2:12,3:12,4:12

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