The simplest combination of arrays we just use Array_merge to
Array_merge () merges the cells of two or more arrays, and the values in one array are appended to the previous array. Returns an array as the result.
When the
array key name is a numeric key name, when the two arrays to be merged have the same number key in the same name, using Array_merge () does not overwrite the original value, and using the "+" merge array will return the first occurrence as the final result, and those values with the same key name as the following array "Discard" Off (note: Instead of overwriting, keep the first occurrence of the value). Example:
Copy Code code as follows:
$array 1 = array (1=> ' 0 ');
$array 2 = Array (1=> "data");
$result 1 = $array 2 + $array 1;/* result is $array2 value * *
Print_r ($result);
$result = $array 1 + $array 2;/* Result $array1 Value * *
Print_r ($result);
$result 3 = Array_merge ($array 2, $array 1),/* results are $array2 and $array1 values, the key name is reassigned * *
Print_r ($result 3);
$result 4 = Array_merge ($array 1, $array 2),/* results are $array1 and $array2 values, the key name is reassigned * *
Print_r ($result 4);
output results are:
Array ([1] => data)
Array ([1] => 0)
Array (
[0] => data
[1] => 0
)
Array
(
[0] => 0
[1] => data
)
2. When the same array key name is a character, the "+" operator is the same as when the key is a number, but Array_merge () overrides the previous value of the same key name.
Example:
Copy Code code as follows:
$array 1 = Array (' ASD ' => ' 0 ');
$array 2 = Array (' ASD ' => "data");
$result 1 = $array 2 + $array 1;/* result is $array2 value * *
Print_r ($result);
$result = $array 1 + $array 2;/* Result $array1 Value * *
Print_r ($result);
$result 3 = Array_merge ($array 2, $array 1);/* The result is $array1*/
Print_r ($result 3);
$result 4 = Array_merge ($array 1, $array 2);/* The result is $array2*/
Print_r ($result 4);
output results are:
Array ([ASD] => data)
Array ([ASD] => 0)
Array ([ASD] => 0)
Array ([ASD] => data)
told so many crap, the following is the
I want to introduce to you friends
array reorganization based on the category field
Copy Code code as follows:
<?php
//need to reorganize the array
$arrar =array ();
$array []=array (' ItemID ' => 110126866896, ' CategoryID ' =>111);
$array []=array (' ItemID ' => 120126866896, ' CategoryID ' =>112);
$array []=array (' ItemID ' => 130126866896, ' CategoryID ' =>113);
$array []=array (' ItemID ' => 140126866896, ' CategoryID ' =>114);
$array []=array (' ItemID ' => 150126866896, ' CategoryID ' =>115);
$array []=array (' ItemID ' => 160126866896, ' CategoryID ' =>116);
$array []=array (' ItemID ' => 170126866896, ' CategoryID ' =>117);
$array []=array (' ItemID ' => 118126866896, ' CategoryID ' =>111);
$array []=array (' ItemID ' => 121126866896, ' CategoryID ' =>112);
$array []=array (' ItemID ' => 132126866896, ' CategoryID ' =>113);
$array []=array (' ItemID ' => 143126866896, ' CategoryID ' =>114);
$array []=array (' ItemID ' => 154126866896, ' CategoryID ' =>115);
$array []=array (' ItemID ' => 1651268668, ' CategoryID ' =>116);
$array []=array (' ItemID ' => 176126866896, ' CategoryID ' =>117); The
//array is reorganized according to the classification
$newArray =array ();
foreach ($array as $val) {
$newArray [$val [' CategoryID ']][]= $val;
}
//delete original array free space
$array =null;
Unset ($array);
Print_r ($newArray);
?>
