foreach

PHP 4 introduced a foreach construct, much like Perl and some other languages. This simply gives an easy way to iterate over arrays. foreach works only on arrays, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes; the second is a minor but useful extension of the first:

foreach (array_expression as $value)

statement

foreach (array_expression as $key => $value)

statement

via PHP: foreach – Manual.

One of the downsides to jumping between Python and PHP, can’t always remember the syntax.