CODEWITHSUNDEEP
phpvariable-variables
Hào Nghiêm Xuân
Hào Nghiêm Xuân

Reputation: 53

php: How to get element in array by index using variable-variables

If I have:

<?php
$params=[
    [
        'string'
    ]
];
//params get from $this->params()->fromPost();
$abc='params[0][0]';//$abc dynamiccly

I cannot access $params[0]

How to get string element?

I try to use

echo $$abc;

But

Notice: Undefined variable params[0][]

Upvotes: 0

Views: 1639

Answers (3)

Afshan Shujat
Afshan Shujat

Reputation: 551

For accessing the values of dynamic varible you can execute a loop- 

<?php
$params=[
    'string'
];
$abc= 'params';

foreach($$abc as $k=>$v){
    echo $v;
}

?>

If you want to access it directly by index so you need to reassign the dynamic variable in another variable like $newArr = $$abc and then access $newArr.

Upvotes: 0

roberto06
roberto06

Reputation: 3864

If $abc is defined dynamically, you have to split it in two variables : $arrayName and $arrayKey, as such : 

$params = array('string');
$abc = 'params[0]';
$arrayName = substr($abc,0,strpos($abc,'['));
$arrayIndex = preg_replace('/[^\d\s]/', '',$abc);
echo ${$arrayName}[$arrayIndex]; // returns "string"

Upvotes: 2

AmmyTech
AmmyTech

Reputation: 738

use below way to access string

$params=[
    'string'
];
$abc='params';

$new = $$abc;
echo $new[0];

Upvotes: 2

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