Php multi-dimensional array quickly queries the parent key and parent key value based on the key name

Php multi-dimensional array quickly queries the parent key and parent key value based on the key name

/** * FILE_NAME: arr. php FILE_PATH: test/ * Quick query of the parent key and parent key value based on the key name in a multi-dimensional array * * @ Copyright Copyright (c) 2006-2010 * @ Author Levi * @ Package test. arr * @ Subpackage * @ Version 2011-04-29 * @ Link bbs.it-home.org */ Header ("Content-Type: text/html; charset = utf-8 "); $ Arr = array ( 'China' => array ( 'Name' => 'China ', 'Cite '=> array ( 'Beijing' => array ( 'Name' => 'Beijing ', 'Site' => array ('chunyang' => 'chaoyang District ', 'xuanwu' => 'xuanwu District ') ), 'Shanghai' => array ( 'Name' => 'Shanghai ', 'Site' => array ('jinganc' => 'jing 'an District ', 'huangpu' => 'huangpu District ') ) ) ) ); Function printA ($ data) { Echo' '; print_r($data); echo ' '; } Function indexKey ($ data, $ parent = NULL) { $ Arr = array (); Foreach ($ data as $ key => $ value) { $ Arr [$ key] = $ parent; If (is_array ($ value )) { $ Arr + = indexKey ($ value, $ key ); } } Return (Array) $ arr; } PrintA (indexKey ($ arr )); ?> Print the following data: Array ([china] => [name] => china [cite] => china [beijing] => cite [site] => beijing [chaoyang] => site [xuanwu] => site [shanghai] => cite [jingan] => site [huangpu] => site) but there is a problem with writing like this: if there is a key with the same name, it will lead to loss, so I write such a class and only need to pass the array to the object, the object provides two interfaces: printArr printing index array search query key name parent array key name IndexKey creation query index query class: /** * FILE_NAME: arr. php FILE_PATH: test/ * Quick query of the parent key and parent key value based on the key name in a multi-dimensional array * * @ Copyright Copyright (c) 2006-2010 * @ Author Levi * @ Package test. arr * @ Subpackage * @ Version 2011-04-29 * @ Link bbs.it-home.org */ Header ("Content-Type: text/html; charset = utf-8 "); $ Arr = array ( 'China' => array ( 'Name' => 'China ', 'Cite '=> array ( 'Beijing' => array ( 'Name' => 'Beijing ', 'Site' => array ('chunyang' => 'chaoyang District ', 'xuanwu' => 'xuanwu District ') ), 'Shanghai' => array ( 'Name' => 'Shanghai ', 'Site' => array ('jinganc' => 'jing 'an District ', 'huangpu' => 'huangpu District ') ) ) ) ); Function printA ($ data) { Echo' '; print_r($data); echo ' '; } Function printP (IndexKey $ obj, $ key) { $ Parent = $ obj-> search ($ key ); If ($ parent) { Echo '"'. $ key. '" Parent Key is :'; If (! Is_array ($ parent )) { Echo $ parent ." \ N "; } Else printA ($ parent ); } Else echo 'no Parent or no Search of "'. $ key .'"! '." \ N "; } Class IndexKey { Private $ _ arr = array (); Public function _ construct ($ data) { $ This-> _ createIndex ($ data ); } Public function printArr () { Return (Array) $ this-> _ arr; } Public function search ($ key) { Return isset ($ this-> _ arr [$ key])? $ This-> _ arr [$ key]: NULL; } Private function _ createIndex ($ data, $ parent = NULL) { Foreach ($ data as $ key => $ value) { $ This-> _ checkIndex ($ key, $ parent ); If (is_array ($ value )) { $ This-> _ createIndex ($ value, $ key ); } } } Private function _ checkIndex ($ key, $ parent) { $ Index = isset ($ this-> _ arr [$ key])? $ This-> _ arr [$ key]: NULL; If ($ index) { If (is_array ($ index )) { Array_push ($ this-> _ arr [$ key], $ parent ); } Else $ this-> _ arr [$ key] = array ($ index, $ parent ); } Else $ this-> _ arr [$ key] = $ parent; } } $ Index = (Object) new IndexKey ($ arr ); PrintA ($ index-> printArr ()); PrintP ($ index, 'Beijing '); PrintP ($ index, 'name '); PrintP ($ index, 'China '); ?> At last, only one data output is missing, so I modified this class and provided three external methods: printArr print index array search query key name parent array key name parentValue query parent key value /** * FILE_NAME: arr. php FILE_PATH: test/ * Quick query of the parent key and parent key value based on the key name in a multi-dimensional array * * @ Copyright Copyright (c) 2006-2010 * @ Author Levi * @ Package test. arr * @ Subpackage * @ Version 2011-04-29 * @ Link bbs.it-home.org */ Header ("Content-Type: text/html; charset = utf-8 "); $ Arr = array ( 'China' => array ( 'Name' => 'China ', 'Cite '=> array ( 'Beijing' => array ( 'Name' => 'Beijing ', 'Site' => array ('chunyang' => 'chaoyang District ', 'xuanwu' => 'xuanwu District ') ), 'Shanghai' => array ( 'Name' => 'Shanghai ', 'Site' => array ('jinganc' => 'jing 'an District ', 'huangpu' => 'huangpu District ') ) ) ) ); Function printA ($ data) { Echo' '; print_r($data); echo ' '; } Function printP2 (IndexArr $ obj, $ key) { $ Parent = $ obj-> search ($ key ); If (! Is_array ($ parent )) { If ($ parent) { Echo '"'. $ key. '" Parent Key is:'. $ parent ." \ N "; } Else echo 'no Parent or no Search of "'. $ key .'"! '." \ N ";; Echo '"'. $ key. '" Parent "'. $ parent. '" Value is :'; PrintA ($ obj-> parentValue ($ key )); } Else printA ($ parent ); } Class IndexArr { Private $ _ arr = array (); Public function _ construct ($ data) { $ This-> _ createIndex ($ data ); } Public function printArr () { Return (Array) $ this-> _ arr; } Public function search ($ key) { Return isset ($ this-> _ arr [$ key])? $ This-> _ arr [$ key] ['parent']: NULL; } Public function parentValue ($ key) { Return isset ($ this-> _ arr [$ key])? $ This-> _ arr [$ key] ['data']: NULL; } Private function _ createIndex ($ data, $ parent = NULL) { Foreach ($ data as $ key => $ value) { $ This-> _ checkIndex ($ key, $ parent, $ data ); If (is_array ($ value )) { $ This-> _ createIndex ($ value, $ key ); } } } Private function _ checkIndex ($ key, $ parent, $ data) { $ Data = $ parent & isset ($ data [$ parent])? $ Data [$ parent]: $ data; ! Isset ($ this-> _ arr [$ key]) & $ this-> _ arr [$ key] = array ('data' => $ data, 'parent' => ''); $ Index = & $ this-> _ arr [$ key] ['parent']; If (! Empty ($ index )) { If (is_array ($ index )) { Array_push ($ index, $ parent ); } Else $ index = array ($ index, $ parent ); } Else $ index = $ parent; } } $ Index2 = (Object) new IndexArr ($ arr ); PrintA ($ index2-> printArr ()); PrintP2 ($ index2, 'Beijing '); PrintP2 ($ index2, 'name '); PrintP2 ($ index2, 'China '); ?>