Description:
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Strings variables parsing, documented on http://ca2.php.net/manual/en/language.types.string.php#language.types.string.parsing
, has two forms: the simple and the complex syntax. Examples for each syntax are given, but some complex examples are in the simple section:

<?php
// These examples are specific to using arrays inside of strings.
// When outside of a string, always quote array string keys and do not use
// {braces}.

// Show all errors
error_reporting(E_ALL);

$fruits = array('strawberry' => 'red', 'banana' => 'yellow');

// Works, but note that this works differently outside a string
echo "A banana is $fruits[banana].";

// Works
echo "A banana is {$fruits['banana']}.";

// Works, but PHP looks for a constant named banana first, as described below.
echo "A banana is {$fruits[banana]}.";

// Won't work, use braces.  This results in a parse error.
echo "A banana is $fruits['banana'].";

// Works
echo "A banana is " . $fruits['banana'] . ".";

// Works
echo "This square is $square->width meters broad.";

// Won't work. For a solution, see the complex syntax.
echo "This square is $square->width00 centimeters broad.";
?>

The examples of {$fruits['banana']} and {$fruits[banana]} (inside curly braces) already have equivalents in the complex syntax section.