$$ array variable in PHP [duplicate] - php

Question

This question already has answers here:
Access array using dynamic path
(3 answers)
Closed 7 years ago.
I can use $$ variables to refer variable like this
$var = 'car';
$car = 'Lamborghini';
echo $$var;
Above code will echo Lamborghini.
However I am having a code like this:-
$var = "['acct_1']['etc']['anotherInfo']['sing']";
$var = 'arr'.$var;
echo $arr['acct_1']['etc']['anotherInfo']['sing'] ;
echo $$var;
First echo prints the correct value but $$var doesn't give the correct value.
Any help is much appreciated.
Thanks

Answer 1

You can always keep the keys in an array, and then iterate on them to resolve the value correctly:
$keys = ['acct_1', 'etc', 'anotherInfo', 'sing'];
$val = $arr;
foreach($keys as $key) {
$val = $val[$key];
}
Now, both $arr['acct_1']['etc']['anotherInfo']['sing'] and $val have the same value.
Try it in this demo.
Edit:
You already have the $keys array in $indexInfo. You should be able to use it like so:
function replaceValue($arr, $indexInfo, $char)
{
// $indexInfo is all you need!
$var = $arr;
foreach($indexInfo as $key) {
$var = $var[$key];
}
echo $arr['acct_1']['etc']['anotherInfo']['sing'] . "\n";
echo $var . "\n";
die($var);
}

Answer 2

That won't work unfortunately, however why not do something line this
/**
* Search into a multi dimensional array to find arbitrary data
* #param array $array The array to search
* #param string ... Any number of array keys
* #return mixed
*/
function deepArraySearch(array $array) {
$keys = func_get_args();
array_shift($keys); // First element is the array
// If no more keys to use
if(!$keys) {
return $array;
}
$nextKey = array_shift($keys);
$nextData = $array[$nextKey];
// Nothing left to search
if(!is_array($nextData )) {
return $nextData ;
}
array_unshift($keys, $nextData);
return call_user_func_array('deepArraySearch', $keys);
}
$arr = ['one' => ['two' => ['three' => 'data']]];
print_r(deepArraySearch($arr, 'one'));
print_r(deepArraySearch($arr, 'one', 'two'));
print_r(deepArraySearch($arr, 'one', 'two', 'three'));
echo PHP_EOL;
In your case I guess it would work like this
$arr = ['acct_1' => ['etc' => ['anotherInfo' => ['sing' => 'song']]]];
print_r(deepArraySearch($arr, 'acct_1', 'etc', 'anotherInfo', 'sing')); // song
Final note:
If you're using PHP 5.6, 7, or HHVM, this function is way nicer:
<?php
/**
* Search into a multi dimensional array to find arbitrary data
* #param array $array The array to search
* #param string ... Any number of array keys
* #return mixed
*/
function deepArraySearch(array $array, ...$keys) {
// If no more keys to use
if(!$keys) {
return $array;
}
$nextKey = array_shift($keys);
$nextData = $array[$nextKey];
// Nothing left to search
if(!is_array($nextData )) {
return $nextData ;
}
return deepArraySearch($nextData, ...$keys);
}
Demo: http://3v4l.org/vmocO