Efficient way to search array with substring - php

Question

This is my array.
array (
0 =>
(object) array(
'per_unit_price' => NULL,
'code' => 'dynamic_labour_cost',
'text_value' => '1000',
),
1 =>
(object) array(
'per_unit_price' => NULL,
'code' => 'dynamic_metal_weight',
'text_value' => '10',
),
2 =>
(object) array(
'per_unit_price' => NULL,
'code' => 'dynamic_stone_carat',
'text_value' => '10',
),
3 =>
(object) array(
'per_unit_price' => NULL,
'code' => 'dynamic_stone2_carat',
'text_value' => '10',
),
4 =>
(object) array(
'per_unit_price' => '10.00',
'code' => 'dynamic_metal',
'text_value' => NULL,
),
5 =>
(object) array(
'per_unit_price' => '20.00',
'code' => 'dynamic_stone',
'text_value' => NULL,
),
6 =>
(object) array(
'per_unit_price' => '50.00',
'code' => 'dynamic_stone2',
'text_value' => NULL,
),
)
In short,
Let's take an example =
I want to multiply => array[1]['text_value'] * array[4]['per_unit_price']
Because
array[1]['code'] = dynamic_metal_weight is substring of array[4]['code'] = dynamic_metal
As all code are dynamic so I cannot hard code condition.
And I tried using for each [scan all the array] but It will take a lot of time by traditional loops.
Please guide me.

Answer 1

As suggested by #Chris Haas, this solution is based on the same logic. Based on what I see above in problem description below could help you. Also have provided suggestions to improvise..
<?php
echo "<pre>";
// array of data received from database
$code_values = [
[
'per_unit_price' => NULL,
'code' => 'dynamic_labour_cost',
'text_value' => '1000'
],
[
'per_unit_price' => NULL,
'code' => 'dynamic_metal_weight',
'text_value' => '10'
],
[
'per_unit_price' => NULL,
'code' => 'dynamic_stone_carat',
'text_value' => '10'
],
[
'per_unit_price' => NULL,
'code' => 'dynamic_stone2_carat',
'text_value' => '10'
],
[
'per_unit_price' => '10.00',
'code' => 'dynamic_metal',
'text_value' => NULL
],
[
'per_unit_price' => '20.00',
'code' => 'dynamic_stone',
'text_value' => NULL
],
[
'per_unit_price' => '50.00',
'code' => 'dynamic_stone2',
'text_value' => NULL
]
];
// filter $code_values to extract an array of elements where "per_unit_price" is set i.e. text_value is NULL
// Suggestion to improvise: If from database, you can fetch codes where only per_unit_price are set then this array_filter will not be required
$per_unit_prices = array_filter($code_values, function($array_element) {
return is_null($array_element['text_value']);
});
// create array of per unit prices where code will be key and per_unit_price will be value
$per_unit_prices = array_column($per_unit_prices, 'per_unit_price', 'code');
echo "<br>per_unit_prices<br>";
print_r($per_unit_prices);
// filter $code_values to extract an array of elements where "text_value is set i.e. per_unit_price is NULL
// Suggestion to improvise: If you can fetch codes where only text_values are set then this array_filter will not be required
$text_values = array_filter($code_values, function($array_element) {
return is_null($array_element['per_unit_price']);
});
// create array of text_values where code will be key and text_value will be value
$text_values = array_column($text_values, 'text_value', 'code');
echo "<br>text_values<br>";
print_r($text_values);
$output = []; // array to store multiplication of per_unit_price and text_value of matching elements
foreach($text_values as $code => $value) {
// create key of per_unit_price by removing last string part starting with _
$per_unit_prices_key = implode('_', array_slice(explode('_', $code), 0, -1));
// check if per_unit_prices_key exits in $per_unit_prices array we created. If so, create output value
if(isset($per_unit_prices[$per_unit_prices_key])) {
$output[$code] = (float) $value * (float)$per_unit_prices[$per_unit_prices_key];
}
}
echo "<br>output<br>";
print_r($output);
This is the output of the above code.
per_unit_prices
Array
(
[dynamic_metal] => 10.00
[dynamic_stone] => 20.00
[dynamic_stone2] => 50.00
)
text_values
Array
(
[dynamic_labour_cost] => 1000
[dynamic_metal_weight] => 10
[dynamic_stone_carat] => 10
[dynamic_stone2_carat] => 10
)
output
Array
(
[dynamic_metal_weight] => 100
[dynamic_stone_carat] => 200
[dynamic_stone2_carat] => 500
)