Parse a string as a URL query string

# parse_str

(PHP 4, PHP 5, PHP 7, PHP 8)

parse_str — Parse a string as a URL query string

### Description

parse_str(string `$string`, array `&$result`): void

Parses `string` as if it were the query string passed via a URL and sets keys in the provided `result` array. If no `result` is passed, values are instead set as variables in the current scope.

### Parameters

`string`

  The input string.

`result`

  A variable passed by reference, which will be set to an array containing the key-value pairs extracted from `string`. If the `result` parameter is not passed, a separate variable is set in the local scope for each key.

  Warning

  Using this function without the `result` parameter is highly DISCOURAGED and DEPRECATED as of PHP 7.2. As of PHP 8.0.0, the `result` parameter is mandatory.

### Return Values

No value is returned.

### Changelog

Version | Description
--- | ---
8.0.0 | `result` is no longer optional.
7.2.0 | Usage of parse_str() without a second parameter now emits an `E_DEPRECATED` notice.

### Examples

Example #1 Using parse_str()

`<?php
$str = "first=value&arr[]=foo+bar&arr[]=baz";
// Recommended
parse_str($str, $output);
echo $output['first'], PHP_EOL; // value
echo $output['arr'][0], PHP_EOL; // foo bar
echo $output['arr'][1], PHP_EOL; // baz
?>`

Any spaces and dots in parameter names are converted to underscores when creating array keys or local variables. This is because variable names in PHP are not allowed to contain spaces or dots, but applies even when using this function with the recommended `result` parameter.

Example #2 parse_str() name mangling

`<?php
parse_str("My Value=Something", $output);
echo $output['My_Value']; // Something
?>`

### Notes

> Note:

> parse_str() is affected by the max_input_vars directive. Exceeding this limit triggers an `E_WARNING`, and any variables beyond the limit are not added to the result array. The default is 1000; adjust max_input_vars as needed.

> Note:

> All values populated in the `result` array (or variables created if second parameter is not set) are already URL-decoded using the same rules as urldecode().

> Note:

> To get the query string of the current request, you may use the variable $_SERVER['QUERY_STRING']. Also, you may want to read the section on variables from external sources.

### See Also

- parse_url() - Parse a URL and return its components
- pathinfo() - Returns information about a file path
- http_build_query() - Generate URL-encoded query string
- urldecode() - Decodes URL-encoded string

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