<?php
$arr = [
['张三','男','22'],
['李四','女','23'],
['王五','男','24'],
['赵六','女','25'],
];
//张三，男，22|李四，女，23|王五，男，24|赵六，女，25
foreach ($arr as $item){
$temp[] = implode(',',$item);
}
$str = implode('|',$temp);
echo $str;