Linked by John Collins on Wed 21st Apr 2004 06:42 UTC
The purpose of this article is to give a novice programmer the basic idea of what OOP is, as implemented using PHP. Readers should have a basic knowledge of programming ie what variables are, variable types, basic methods of writing comments, and how to enter code into a text editor.
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When using variable interpolation in PHP (which occurs automatically with double quoted strings but not with single), the braces act to disambiguate variables from the surrounding text.
Example:
$foo = 'spam'
$bar = '$foo to you'
$wrongbaz = "$foos to you"
$baz = "{$foo}s to you"
echo $foo, $bar, $wrongbaz, $baz
Should print:
spam
$foo to you
$foos to you
spams to you
Notice that it's impossible to tell whether you mean to look up the variable $foos or whether you're trying to add an 's' onto variable $foo, hence the need for braces.