This article describes a PHP two-dimensional array with a key to group add the instance program, if the data from the database can be a large select SUM (t_value), t_id from T_table Group by t_id, But if you're dealing with a similar problem in a PHP program that's a bit tricky, here's a function to handle a similar problem
Copy Code code as follows:
<?php
/* Function function: The two-dimensional array is added with a key name to return the new two-dimensional array
* Parameter Description: $arr-source Array, $new _arr-added after the new array; $target _key-the key name to be grouped
*/
function Add_array ($arr, & $new _arr, $target _key) {
$num = count ($new _arr); Computes the size of the new array, which is also two-dimensional, and this computes the first dimensional
for ($i = 0; $i < $num; $i + +) {
//Cyclic new array
The
//if block mainly determines whether the current group's key name already exists in the new array, avoiding duplication
//Because the function is called circularly, and the new array may have more than 1 elements, you must compare each element in the new array,
The element of the
//new array is a one-dimensional array $i the dynamic comparison of the group key names in the new two-dimensional array
if ($arr [$target _key]!= $new _arr[$i [$target _key]) {//Determine if the grouping key name in the new array is equal to the group key name in the current source array
$cmp _num++; If not equal, the number of comparisons is increased by 1
} else {//if equal, indicates that the current group key name already exists
$tar _exist = true; The setting exists with the identity of true
$tar _key = $i; Returns the numeric index of the current group key name in the new array
break; Jump out of the loop
}
}
///If the comparison is the same as the new array size, the current group key name is not in the new array, and the setting has an ID of false
if ($cmp _num = = $num)
$tar _exist = false;
if ($tar _exist) {//If the group key name already exists, add the array elements of the group
foreach ($arr as $key => $value) {
if ($key!= $target _key) {//group key name corresponding to the element value is not added
$new _arr[$tar _key][$key]+= $value; The remaining element values are added
}
}
} else {
//If the group key name does not exist
//sets the new group key name and adds the array elements of the group
The first dimension of the
//new array uses $num parameters to distinguish the order of the current group
//Because $num is actually the new array, the number of key names is grouped and is starting at 0, so the index of the new grouping in the new array is directly $num.
//Without the need for $num+1
$new _arr[$num] [$target _key] = $arr [$target _key];
foreach ($arr as $key => $value) {
if ($key!= $target _key) {//group key name corresponding to the element value is not added
$new _arr[$num] [$key]+= $value; The remaining element values are added
}
}
}
}
$arr = Array (
Array (' group_id ' =>, ' Team_price ' => 88.00, ' Satopay_price ' => 85.00, ' team_id ' => 348, ' origin ' = > 440, ' Gain ' => 14.45, ' quantity ' => 5),
Array (' group_id ' =>, ' team_price ' => 12.00, ' satopay_price ' => 11.00, ' team_id ' => 344, ' origin ' => 36, ' Gain ' => 2.76, ' Quantity ' => 3),
Array (' group_id ' =>, ' Team_price ' => 4.99, ' Satopay_price ' => 4.60, ' team_id ' => 335, ' origin ' =&G T 4.99, ' Gain ' => 0.31915, ' quantity ' => 1),
Array (' group_id ' =>, ' team_price ' => 12.00, ' satopay_price ' => 11.00, ' team_id ' => 344, ' origin ' = >, ' Gain ' => 1.84, ' quantity ' => 2),
Array (' group_id ' =>, ' team_price ' => 13.00, ' Satopay_price ' => 11.00, ' team_id ' => 344, ' origin ' = >, ' Gain ' => 1.84, ' quantity ' => 2),
);
$new _arr = Array ();
foreach ($arr as $key => $value) {
Add_array ($value, & $new _arr, ' group_id '); Here we press group_id to group add
}
var_dump ($new _arr);
