Calculate the average value of an array. Calculate the average value of a two-dimensional array.
| The code is as follows: |
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$ Array = array (
Array ('class' => 'A', 'value' => 3 ),
Array ('class' => 'A', 'value' => 4 ),
Array ('class' => 'B', 'value' => 5 ),
Array ('class' => 'B', 'value' => 6)
) |
Such arrays can be grouped by class key values to calculate the average value.
You can also calculate the total average value separately. The usage is as follows:
| The code is as follows: |
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Array_avg ($ array, 'class'); // returns a two-dimensional array.
Array_avg ($ array); // returns a one-dimensional array.
// Returns a one-dimensional array after calculating the average value.
// Parameter $ avgby returns a two-dimensional array based on the average value of the specified field
Private function array_avg ($ array, $ avgby = NULL ){
$ Array_avg = array ();
$ Number = count ($ array );
Foreach ($ array as $ key => $ value ){
If ($ avgby ){
$ Avg_key = $ value [$ avgby];
$ Array_avg [$ avg_key] ['count'] ++;
Foreach ($ value as $ k => $ v ){
$ Array_avg [$ avg_key] [$ k] + = $ v;
}
} Else {
Foreach ($ value as $ k => $ v ){
$ Array_avg [$ k] + = $ v;
}
}
}
$ Array = array ();
Foreach ($ array_avg as $ key => $ value ){
If ($ avgby ){
Foreach ($ value as $ k => $ v ){
$ Array [$ key] [$ k] = $ v/$ value ['count'];
}
} Else {
$ Array [$ key] = $ value/$ number;
}
}
Return $ array;
} |
