How PHP extracts a single value from an array

This time for you to bring PHP how to take out a single value in the array, PHP takes the individual values in the array of considerations, the following is the actual case, together to see.

1. Array arr

The Var_dump (ARR) values are as follows:

Array (size=3) ' delete ' = =  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)

echo $arr [' old '][0]; print out: Hbsflyrecode20170221-101507.txt

However, if Arr is in the form of an object, the print results are as follows:

Var_dump (Arr) object (StdClass) [1] public ' delete ' = =  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)

You cannot use $arr [' old '][0] to take a value, you can use ARR objects and arrays of common foreach methods:

function GetValue ($arr) {foreach ($arr as $key = = $value) {  if (Is_array ($value)) {   getValue ($value);  } else{   echo $value. " <br> ";  } }}

If Arr is in the form of an object, you can test the object into an array form, which provides a quick way to:

1. $object _json = Json_encode ($arr); Get the object

$json = Json_encode ($arr, true); get pure JSON

2. Json_decode ($object _json) and Json_decode ($json) get the Array object

Json_decode ($object _json,true) and Json_decode ($json, true) get the array

In summary, you can convert an array object to an array:

Arr=jsondecode (Jsonencode (Arr=jsondecode (Jsonencode (arr,true), true);

This problem is found in the project, it is recommended that when you convert JSON and array in PHP, the second parameter of Json_encode () and Json_decode () is added true, namely:

Json_encode (arr,true); Jsondecode (arr,true); Jsondecode (json,true);

Believe that you have read the case of this article you have mastered the method, more exciting please pay attention to the PHP Chinese network other related articles!

Recommended reading:

PHP reserved Key value + Merge array

How to exclude duplicate values in a two-dimensional array

Methods for distinguishing associative arrays from indexed arrays