How does php convert arrays into strings?

Problem
Converting arrays into strings
Solution
For an array question, I get a two-dimensional array variable: $ postanswer =$ _ POST ["answer {$ showarr ['cs _ id']}"];
The printed value of the copied code is Array.

(

[43] => Array

(

[A] =>

[B] => B

)



[42] => Array

(

[C] => C

[D] => D

)



[41] => Array

(

[B] => B

[C] => C

)



[40] => Array

(

[B] => B

[D] => D

)



[39] => Array

(

[A] =>

[D] => D

)



[35] => Array

(

[B] => B

)



)
Copy the code. Now I want to group the previous IDCs and separate the group members with commas. I don't know which hero can help me. Thank you!


Reference answer




$ MyArr = array ();

$ ListArr = array ();

Foreach ($ _ POST ["answer {$ showarr ['cs _ id']}"] as $ key => $ item ){

Foreach ($ item as $ key2 => $ value ){

$ ListArr [] = $ key2. '-'. $ value;

}



$ MyArr [$ key] = join (',', $ listArr );

}

Var_dump ($ myArr );


Copy code ?? So?
Reference answer
Separated by t
Reference answer
Original Post published by yafeikf at [url = http://bbs.111cn.cn/redirect.php? Goto = findpost & pid = 813511 & ptid = 100247] link mark [img] http://bbs.111cn.cn/images/common/back.gif?/img=#/url]


Hey! No! Display: array (5 ){

[47] =>

String (3) "A, B"

[46] =>

String (7) "A, B, B, C"

[45] =>

String (11) "A, B, B, C, A, C"

[44] =>

String (15) "A, B, B, C, A, C, B, D"

[36] =>

String (19) "A, B, B, C, A, C, B, D, C, D"

}
Is it a loop problem to copy the code?

[]
Reference answer
Yes! I have not tested it!

$ Postanswer =$ _ POST ["answer {$ showarr ['cs _ id']}"];

$ New_array = array ();



For ($ postanswer as $ key => $ value ){

If (isset ($ new_array [$ key]) {

$ New_array [$ key]. = ','. $ value;

} Else {

$ New_array [$ key] = $ value;

}

}



Print_r ($ new_array );

?>


Copy code
Reference answer
Let's change your mind.
Not to mention how to implement it, but first think about your intention.

This will cause problems. What if there is "," in your array?
How can you restore it?

Get rid of this idea and use serialize and unserialize.
Reference answer
Original Post published by liexusong at, [url = http://bbs.111cn.cn/redirect.php? Goto = findpost & pid = 813732 & ptid = 100247] link mark [img] http://bbs.111cn.cn/images/common/back.gif?/img=#/url]
Yes! I have not tested it!



Haha... No! By the way, an error occurs. Should it be foreach rather than for loop?
Reference answer
Original Post published by hubinhust at [url = http://bbs.111cn.cn/redirect.php? Goto = findpost & pid = 813834 & ptid = 100247] link mark [img] http://bbs.111cn.cn/images/common/back.gif?/img=#/url]
Let's change your mind.
Not to mention how to implement it, but first think about your intention.

This will cause problems. What if there is "," in your array?
How can you restore it?

Get rid of this idea and use serialize and unserialize.
This should not appear, at least here! Because I submitted the test answer ABCD.
Reference answer
Oh ~ I saw it wrong! It should be like this!

$ Postanswer =$ _ POST ["answer {$ showarr ['cs _ id']}"];

$ New_array = array ();



Foreach ($ postanswer as $ element ){

Foreach ($ element as $ key => $ value ){

If (isset ($ new_array [$ key]) {

$ New_array [$ key]. = ','. $ value;

} Else {

$ New_array [$ key] = $ value;

}

}

}



Print_r ($ new_array );

?>


Copy code
Reference answer
Original Post published by liexusong at 2009-1-3 20:10 [url = http://bbs.111cn.cn/redirect.php? Goto = findpost & pid = 813889 & ptid = 100247] link mark [img] http://bbs.111cn.cn/images/common/back.gif?/img=#/url]
Oh ~ I saw it wrong! It should be like this!



We can't do it this time, but we can output this: Array

(

[A] => A,

[D] => D, D, D

[B] => B, B

[C] => C

)
Copy code