Understanding the Array Diff and Intersect Functional Family

[iwato]

Question One: Have you ever tried to figure out why there are so many variations of the array_intersect() and array_diff() functions?Question Two: More importantly would you like a way to find the one you want at a glance?Code Description: The following two arrays contain all the information you need to know to distinguish among these two groups of functions.The top two subarrays in each main array provide a table caption and column headers, should you like to make a table.

			$array_intersect = array(				'table_caption' => 'The Array Intersect Family - A Comparison of Use',				'column_header' => array('intersect function','value matches', 'key matches', 'value function', 'key function'),				'array_intersect' => array('value' => '1', 'key' => '0', 'val_func' => '0', 'key_func' => '0'),				'array_intersect_key' => array('value' => '0', 'key' => '1', 'val_func' => '0', 'key_func' => '0'),				'array_intersect_assoc' => array('value' => '1', 'key' => '1', 'val_func' => '0', 'key_func' => '0'),				'array_uintersect' => array('value' => '1', 'key' => '0', 'val_func' => '1', 'key_func' => '0'),				'array_intersect_ukey' => array('value' => '0', 'key' => '1', 'val_func' => '0', 'key_func' => '1'),				'array_uintersect_assoc' => array('value' => '1', 'key' => '1', 'val_func' => '1', 'key_func' => '0'),				'array_intersect_uassoc' => array('value' => '1', 'key' => '1', 'val_func' => '0', 'key_func' => '1'),				'array_uintersect_uassoc' => array('value' => '1', 'key' => '1', 'val_func' => '1', 'key_func' => '1')				);			$array_diff = array(				'table_caption' => 'The Array Diff Family - A Comparison of Use',				'column_header' => array('intersect function','value matches', 'key matches', 'value function', 'key function'),				'array_diff' => array('value' => '1', 'key' => '0', 'val_func' => '0', 'key_func' => '0'),				'array_diff_key' => array('value' => '0', 'key' => '1', 'val_func' => '0', 'key_func' => '0'),				'array_diff_assoc' => array('value' => '1', 'key' => '1', 'val_func' => '0', 'key_func' => '0'),				'array_udiff' => array('value' => '1', 'key' => '0', 'val_func' => '1', 'key_func' => '0'),				'array_diff_ukey' => array('value' => '0', 'key' => '1', 'val_func' => '0', 'key_func' => '1'),				'array_udiff_assoc' => array('value' => '1', 'key' => '1', 'val_func' => '1', 'key_func' => '0'),				'array_diff_uassoc' => array('value' => '1', 'key' => '1', 'val_func' => '0', 'key_func' => '1'),				'array_udiff_uassoc' => array('value' => '1', 'key' => '1', 'val_func' => '1', 'key_func' => '1')				);My way to say thanks to everyone for your help.Roddy

[boen_robot]

There's little need to say this, but I'll say it anyway - if you build yourself a blog, you can count me in as your regular reader .

[iwato]

There's little need to say this, but I'll say it anyway - if you build yourself a blog, you can count me in as your regular reader.

As always, thank you for your encouragement and ever ready helpfulness.Roddy