In-depth analysis of parse_str() function in PHP

The string stored in PHP may be the value of multiple variables (such as URL), so in order to finally get the value of each variable , how to parse a string into multiple variables, PHP provides us with the parse_str() function, which can successfully solve this problem. This article will take you to learn about it.

First, let’s take a look at the syntax of parse_str():

parse_str( string $string   , array &$result )

• $string The input string.

• $result If the second variable $result is set, the variable will be stored in this array in the form of array elements. As an alternative, PHP 7.2 will abandon not setting parameters. Behavior.

• Return value: No return value.

Code example:

1. The form with the second parameter:

<?php
$str = "first=php&arr[]=foobar&arr[]=baz&info=.cn";
parse_str($str, $output);
echo $output[&#39;first&#39;];  // value
echo "<br>";
echo $output[&#39;arr&#39;][0]; // foo bar
echo "<br>";
echo $output[&#39;arr&#39;][1]; // baz
echo "<br>";
echo $output[&#39;info&#39;];
echo "<br>";
print_r($output);

2. Only The form of a parameter:

输出：  php
        foobar
        baz
        .cn
        Array ( [first] => php [arr] => Array ( [0] => foobar [1] => baz ) [info] => .cn )

<?php
$str = "first=php&arr[]=foobar&arr[]=baz&info=.cn";
parse_str($str);
echo $first."<br>";  
echo $arr[0]."<br>"; 
echo $arr[1]."<br>"; 
echo $info[0];

Using parse_str() without the second parameter in PHP7.2.0 will generate a E_DEPRECATED warning,#result is a must in ##PHP8.0.0, so the second one is not recommended.

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