Ask the question about array merging

Ask for an array merge problem
This post was last edited by lumengabc on 2014-01-19 20:13:57

$a = array (' sh ' =>500, ' BJ ' =>100, ' JX ' =>20);
$b = Array (' BJ ' =>5, ' CQ ' =>50, ' sh ' =>0);

Ask to merge $ A and $b to  get the result:
$c =array (
' Sh ' =>array (500,0),
' BJ ' =>array (100,0),
' JX ' =>array (20,0),
' CQ ' =>array (0,50),
);

That is, in the order of the array $ A, the value of $b is superimposed to the corresponding $ A
------Solution--------------------

$a = array (' sh ' =>500, ' BJ ' =>100, ' JX ' =>20);
$b = Array (' BJ ' =>5, ' CQ ' =>50, ' sh ' =>0);
$keys = Array_keys (Array_merge ($a, $b));

foreach ($keys as $k) {
    $ar [$k]=array ($a [$k]? $a [$k]: 0, $b [$k]? $b [$k]: 0);
}
Print_r ($ar);

Array
(
[SH] = = Array
(
[0] = 500
[1] = 0
)

[BJ] = = Array
(
[0] = 100
[1] = 5
)

[JX] = = Array
(
[0] = 20
[1] = 0
)

[CQ] = Array
(
[0] = 0
[1] = 50
)

)
------Solution--------------------

 
  
$a = array (' sh ' = +, ' bj ' = +, ' jx ' = 20);
$b = Array (' bj ' = = 5, ' cq ' = ' + ', ' sh ' = 0);
Var_dump (array_merge_recursive ($a +array_fill_keys (Array_keys (Array_merge ($a, $b)), ' 0 '), $b));

References:

$a = array (' sh ' =>500, ' BJ ' =>100, ' JX ' =>20);
$b = Array (' BJ ' =>5, ' CQ ' =>50, ' sh ' =>0);

Ask to merge $ A and $b to  get the result:
$c =array (
' Sh ' =>array (500,0),
' BJ ' =>array (100,0),
' JX ' =>array (20,0),
' CQ ' =>array (0,50),
);

That is, in the order of the array $ A, the value of $b is superimposed to the corresponding $ A

High performance when the moderator code will be a bug I don't know how big your data is.
You can run the test separately I am php5.5.6 all the moderator code changes slightly or the program will not run (turn off the error output is not a problem with PHP version)

 
  
$pagestartime = Microtime ();
$b = $a = Range (0, 100000);
Array_merge_recursive ($a + array_fill_keys (Array_keys (Array_merge ($a, $b)), ' 0 '), $b);
$pageendtime = Microtime ();
$starttime = Explode ("", $pagestartime);
$endtime = Explode ("", $pageendtime);
$totaltime = $endtime [0]-$starttime [0] + $endtime [1]-$starttime [1];
$timecost = sprintf ("%s", $totaltime);
Var_dump ($timecost);


$pagestartime = Microtime ();
$b = $a = Range (0, 100000);
$keys = Array_keys (Array_merge ($a, $b));
$ar =array ();
foreach ($keys as $k) {
    $ar [$k] = Array (isset ($a [$k])? $a [$k]: 0, isset ($a [$k])? $b [$k]: 0);
}
$pageendtime = Microtime ();
$starttime = Explode ("", $pagestartime);
$endtime = Explode ("", $pageendtime);
$totaltime = $endtime [0]-$starttime [0] + $endtime [1]-$starttime [1];
$timecost = sprintf ("%s", $totaltime);
Var_dump ($timecost);

1w Data
Moderator Code


My Code



10w data
Moderator Code


My Code


100w Database
will appear
Fatal error:allowed memory size of 134217728 bytes exhausted (tried to allocate + bytes) error
Memory_limit to resolve this issue

My local memory_limit = 128M

Moderator Code 9.4W
My Code for 22w

Only research code does not study other

