Parse a csv file to create a nested array [duplicate] - php

Question

This question already has answers here:
How to access and manipulate multi-dimensional array by key names / path?
(10 answers)
Closed last year.
I have an unusual use-case I'm trying to code for. The goal is this: I want the customer to be able to provide a string, such as:
"cars.honda.civic = On"
Using this string, my code will set a value as follows:
$data['cars']['honda']['civic'] = 'On';
It's easy enough to tokenize the customer input as such:
$token = explode("=",$input);
$value = trim($token[1]);
$path = trim($token[0]);
$exploded_path = explode(".",$path);
But now, how do I use $exploded path to set the array without doing something nasty like an eval?

Answer 1

Use the reference operator to get the successive existing arrays:
$temp = &$data;
foreach($exploded as $key) {
$temp = &$temp[$key];
}
$temp = $value;
unset($temp);

Answer 2

Based on alexisdm's response :
/**
* Sets a value in a nested array based on path
* See https://stackoverflow.com/a/9628276/419887
*
* #param array $array The array to modify
* #param string $path The path in the array
* #param mixed $value The value to set
* #param string $delimiter The separator for the path
* #return The previous value
*/
function set_nested_array_value(&$array, $path, &$value, $delimiter = '/') {
$pathParts = explode($delimiter, $path);
$current = &$array;
foreach($pathParts as $key) {
$current = &$current[$key];
}
$backup = $current;
$current = $value;
return $backup;
}

Answer 3

Well tested and 100% working code. Set, get, unset values from an array using "parents". The parents can be either array('path', 'to', 'value') or a string path.to.value. Based on Drupal's code
/**
* #param array $array
* #param array|string $parents
* #param string $glue
* #return mixed
*/
function array_get_value(array &$array, $parents, $glue = '.')
{
if (!is_array($parents)) {
$parents = explode($glue, $parents);
}
$ref = &$array;
foreach ((array) $parents as $parent) {
if (is_array($ref) && array_key_exists($parent, $ref)) {
$ref = &$ref[$parent];
} else {
return null;
}
}
return $ref;
}
/**
* #param array $array
* #param array|string $parents
* #param mixed $value
* #param string $glue
*/
function array_set_value(array &$array, $parents, $value, $glue = '.')
{
if (!is_array($parents)) {
$parents = explode($glue, (string) $parents);
}
$ref = &$array;
foreach ($parents as $parent) {
if (isset($ref) && !is_array($ref)) {
$ref = array();
}
$ref = &$ref[$parent];
}
$ref = $value;
}
/**
* #param array $array
* #param array|string $parents
* #param string $glue
*/
function array_unset_value(&$array, $parents, $glue = '.')
{
if (!is_array($parents)) {
$parents = explode($glue, $parents);
}
$key = array_shift($parents);
if (empty($parents)) {
unset($array[$key]);
} else {
array_unset_value($array[$key], $parents);
}
}

Answer 4

$data = $value;
foreach (array_reverse($exploded_path) as $key) {
$data = array($key => $data);
}

Answer 5

Based on Ugo Méda's response :
This version
allows you to use it solely as a getter (leave the source array untouched)
fixes the fatal error issue if a non-array value is encountered (Cannot create references to/from string offsets nor overloaded objects)
no fatal error example
$a = ['foo'=>'not an array'];
arrayPath($a, ['foo','bar'], 'new value');
$a is now
array(
'foo' => array(
'bar' => 'new value',
),
)
Use as a getter
$val = arrayPath($a, ['foo','bar']); // returns 'new value' / $a remains the same
Set value to null
$v = null; // assign null to variable in order to pass by reference
$prevVal = arrayPath($a, ['foo','bar'], $v);
$prevVal is "new value"
$a is now
array(
'foo' => array(
'bar' => null,
),
)
/**
* set/return a nested array value
*
* #param array $array the array to modify
* #param array $path the path to the value
* #param mixed $value (optional) value to set
*
* #return mixed previous value
*/
function arrayPath(&$array, $path = array(), &$value = null)
{
$args = func_get_args();
$ref = &$array;
foreach ($path as $key) {
if (!is_array($ref)) {
$ref = array();
}
$ref = &$ref[$key];
}
$prev = $ref;
if (array_key_exists(2, $args)) {
// value param was passed -> we're setting
$ref = $value; // set the value
}
return $prev;
}

Answer 6

You need use Symfony PropertyPath
<?php
// ...
$person = array();
$accessor->setValue($person, '[first_name]', 'Wouter');
var_dump($accessor->getValue($person, '[first_name]')); // 'Wouter'
// or
// var_dump($person['first_name']); // 'Wouter'

Answer 7

This is exactly what this method is for:
Arr::set($array, $keys, $value);
It takes your $array where the element should be set, and accept $keys in dot separated format or array of subsequent keys.
So in your case you can achieve desired result simply by:
$data = Arr::set([], "cars.honda.civic", 'On');
// Which will be equivalent to
$data = [
'cars' => [
'honda' => [
'civic' => 'On',
],
],
];
What's more, $keys parameter can also accept creating auto index, so you can for example use it like this:
$data = Arr::set([], "cars.honda.civic.[]", 'On');
// In order to get
$data = [
'cars' => [
'honda' => [
'civic' => ['On'],
],
],
];

Answer 8

Can't you just do this
$exp = explode(".",$path);
$array[$exp[0]][$exp[1]][$exp[2]] = $value