Analysis of the development process of PHP tree structure data Access instance

A PHP tree-structured data access instance class for fast access to tree-structured data, adding subnodes, adding nodes to the index, getting references to itself, converting the tree object to an array, filtering _parent and other fields to avoid infinite loops, Arranges the two-dimensional array in ascending or descending order according to the specified key name.

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First download the PHP tree structure data Access Instance class library that we need to use in this lesson: http://www.php.cn/xiazai/leiku/572

After the download, find the PHP class files we need, unzip to our local directory, create a new PHP file!

Once this is done, we will invoke this class in the new PHP file, and instantiate the class:

<?phpinclude_once "tree.php";//Introduction class file//definition array $arr = array (' id ' = ' +  1, ' name ' = ' php ', ' path ' = ' 1 ') ,  array (' id ' = = 3, ' name ' = ' php1 ', ' path ' = ' 1-3 '),   array (' id ' = = 2, ' name ' = ' mysql ', ' path  ' = ' + ' 2 '),   array (' id ' = = 6, ' name ' = = ' mysql1 ', ' path ' = ' 2-6 '),   array (' id ' = 7, ' name ' = = ' Mysql2 ', ' path ' = ' 2-7 '),   array (' id ' = = 5, ' name ' = ' php11 ', ' path ' = ' 1-3-5 '),   array (' ID ' =& Gt 4, ' name ' = ' php2 ', ' path ' = ' 1-4 '),   $obj = new Tree ($arr); Instantiate $obj->getchild (2);p Rint_r ($obj->getchild (2));//Print result?>

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