php 字符串 -- 数组

1. 数组-->字符串

 

$payment  = array(2) { [0]=> string(2) "10" [1]=> string(2) "20" } 

$res['payment'] = implode('+',$payment);

//$res['payment']  = string(5) "10+20" 

 

 2. 字符串 ->数组

 

paymentAllStr[]  =  str_split($res['payment'])

 

 array(5) { [0]=> string(1) "1" [1]=> string(1) "0" [2]=> string(1) "+" [3]=> string(1) "2" [4]=> string(1) "0" } /

 

$payment = explode('+',$res['payment'])

 

 array(2) { [0]=> string(2) "10" [1]=> string(2) "20" }