php 二维数组下,循环拼接字符串

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以上数组为$teacher=array();

$v="";

for($i=0;$i<count($teacher['teacher_class']);$i++){    if(($i+1)==(count($teacher['teacher_class']))){        $v .= $teacher['teacher_class'][$i];    }else{        $v .= $teacher['teacher_class'][$i].',';    }}$teacher['teacher_class']=$v;
结果:

0 0