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The function

http_build_query

builds a query string for an URI from an associative array.
One of many functions that´s closely connected to web development.

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array_intersect

This function returns the common elements of two or more arrays.

Array function names in PHP are bulky. Apart from implode and explode (respectively join and split), they are almost always prefixed.

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imagefilledarc

Since version 4.0.6, php has builtin image processing with some pretty sophisticated functions. imagefilledarc is one of them. It can be used e.g. for painting a three dimensional pie chart.

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if($a >= $b):

This is the alternative syntax for control structures, which ends when it finds a endif; statement. This syntax can be used with if, while, for, foreach, and switch, and end with endif; endwhile; endfor; endforeach; or endswitch; respectively. This alternative syntax is most used to output html without echoing html tags:

<?php foreach($items as $item): ?>
<p><?php echo $item; ?></p>
<?php endforeach; ?>

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function(){}

This is an example of anonymous function, that can be assigned to a variable, or passed as parameter, for example:

$cmp = function($a,$b) {
  if($a<$b) return -1;
  if($a>$b) return 1;
  return 0;
};
$arr = array(3,1,2);
usort($arr,$cmp);
print_r($arr); // array( [0] => 1, [1] => 2, [2] => 3 )

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