1.数组arr
var_dump(arr) 值如下：
array (size=3)
0 => string 'HBSFlyRecode20170222-101501.txt' (length=31)
1 => string 'HBSFlyRecode20170222-105502.txt' (length=31)
2 => string 'HBSFlyRecode20170222-108803.txt' (length=31)
'new' =>
array (size=3)
0 => string 'HBSFlyRecode20170223-101504.txt' (length=31)
1 => string 'HBSFlyRecode20170223-105505.txt' (length=31)
2 => string 'HBSFlyRecode20170223-108806.txt' (length=31)
'old' =>
array (size=3)
0 => string 'HBSFlyRecode20170221-101507.txt' (length=31)
1 => string 'HBSFlyRecode20170221-105508.txt' (length=31)
2 => string 'HBSFlyRecode20170221-108809.txt' (length=31)
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echo $arr['old'][0];
打印出: HBSFlyRecode20170221-101507.txt
但是如果arr是对象形式,打印结果如下：
array (size=3)
0 => string 'HBSFlyRecode20170222-101501.txt' (length=31)
1 => string 'HBSFlyRecode20170222-105502.txt' (length=31)
2 => string 'HBSFlyRecode20170222-108803.txt' (length=31)
public 'new' =>
array (size=3)
0 => string 'HBSFlyRecode20170223-101504.txt' (length=31)
1 => string 'HBSFlyRecode20170223-105505.txt' (length=31)
2 => string 'HBSFlyRecode20170223-108806.txt' (length=31)
public 'old' =>
array (size=3)
0 => string 'HBSFlyRecode20170221-101507.txt' (length=31)
1 => string 'HBSFlyRecode20170221-105508.txt' (length=31)
2 => string 'HBSFlyRecode20170221-108809.txt' (length=31)
就不能使用 $arr[‘old'][0] 取值了,可以使用arr对象和数组通用的foreach方式取值：
$value){
if(is_array($value)){
getValue($value);
}else{
echo $value."
"; } } }
"; } } }
如果arr为对象形式,可以考录将对象转为数组形式,这里提供一种快捷方式：
1. $object_json = json_encode($arr);得到的是对象
$json = json_encode($arr,true);得到的是纯json
2. json_decode($object_json) 和 json_decode($json)得到的是数组对象
json_decode($object_json,true) 和 json_decode($json,true)得到的是数组
综上,可以将数组对象转为数组的方式：
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arr=jsondecode(jsonencode(arr=jsondecode(jsonencode(arr,true),true);
项目中发现此问题,建议大家在PHP中将json和array转换时,json_encode() 和 json_decode()的第二个参数要加 true,即:
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json_encode(arr,true);jsondecode(arr,true);jsondecode(json,true);
