PHP Tutorial - PHP parse_str() Function

Definition

The parse_str() function converts query string to variables. It has the following format.

Syntax

PHP parse_str() Function has the following syntax.


void parse_str ( string str [, array &arr] )

Parameter

PHP parse_str() Function has the following syntax.

str - The input string.
arr - Optional. If present, variables are stored in this variable as array elements instead.

Return

No value is returned.

Example 1

For example, for URL like mypage.php?foo=bar&bar=baz, Query string is set to foo=bar&bar=baz.

Variables parsed using parse_str() are converted to global variables.


<?PHP/*from w ww . ja  va2s . c o m*/
if (isset($foo)) { 
       print "Foo is $foo<br />"; 
} else { 
       print "Foo is unset<br />"; 
} 

parse_str("foo=bar&bar=baz"); 

if (isset($foo)) { 
       print "Foo is $foo<br />"; 
} else { 
       print "Foo is unset<br />"; 
} 
?>

The code above generates the following result.

Example 2

Optionally, we can pass an array as the second parameter to parse_str(), and it will put the variables into there.


<?PHP//from w  w w .  java  2s .  c om
$array = array(); 

if (isset($array['foo'])) { 
       print "Foo is {$array['foo']}<br />"; 
} else { 
       print "Foo is unset<br />"; 
} 
parse_str("foo=bar&bar=baz", $array); 
if (isset($array['foo'])) { 
        print "Foo is {$array['foo']}<br />"; 
} else { 
        print "Foo is unset<br />"; 
} 
?>

As we can see, the variable names are used as keys in the array, and their values are used as the array values.

The code above generates the following result.