extract
array Set::extract ($path, $data=null, $options=array())
Set::extract uses basic XPath 2.0 syntax to return subsets of your data from a find or a find all. This function allows you to retrieve your data quickly without having to loop through multi dimentional arrays or traverse through tree structures.
If $path is an array or $data is empty it the call is delegated to Set::classicExtract.
Простой текст// Common Usage:$users = $this->User->find("all");$results = Set::extract('/User/id', $users);// results returns:// array(1,2,3,4,5,...);
Currently implemented selectors:
| Selector | Note |
|---|---|
| /User/id | similar to the classic {n}.User.id |
| /User[2]/name | selects the name of the second User |
| /User[id<2] | selects all Users with an id < 2 |
| /User[id>2][<5] | selects all Users with an id > 2 but < 5 |
| /Post/Comment[author_name=john]/../name | Selects the name of all Posts that have at least one Comment written by john |
| /Posts[title] | Selects all Posts that have a 'title' key |
| /Comment/.[1] | Selects the contents of the first comment |
| /Comment/.[:last] | Selects the last comment |
| /Comment/.[:first] | Selects the first comment |
| /Comment[text=/cakephp/i] | Selects the all comments that have a text matching the regex /cakephp/i |
| /Comment/@* | Selects the all key names of all comments |
Currently, only absolute paths starting with a single '/' are supported. Please report any bugs as you find them, and suggestions for additional features are also welcome
To learn more about Set::extract() refer to function testExtract() in /cake/tests/cases/libs/set.test.php.
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