php數組的升維和降維處理

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最近學習了一下php數組的升維和降維，廢話少說，上Demo。

//假設有數組降維前，如下$array = array(‘a‘ => array(‘b‘ => 1,‘c‘ => array(‘d‘ => 2,‘e‘ => 3)),‘f‘ => 4,‘g‘ => array(‘h‘=>5));

　　降維後，如下：

//降維後$array = array(    ‘0‘ => a->b->1,    ‘1‘ => a->c->d->2,    ‘2‘ => a->c->e->3,    ‘3‘ => f->4,    ‘4‘ => g->h->5);

　　實現的function如下：

/** * 將多維陣列降維成一維數組，遞迴實現 * @param unknown $arr * @param string $delimiter * @param string $key * @return boolean|Ambigous <multitype:string , multitype:> */function multiToSingle($arr, $delimiter = ‘->‘,$key = ‘ ‘) {$resultAry = array();if (!(is_array($arr) && count($arr)>0)) {return false;}foreach ($arr AS $k=>$val) {$newKey = trim($key . $k . $delimiter);if (is_array($val) && count($val)>0) {$resultAry = array_merge($resultAry, multiToSingle($val, $delimiter, $newKey));} else {$resultAry[] = $newKey . $val;}}return $resultAry;}

　　數組有降必有升，升維來了：

/** * 將一維數組升維成多維陣列 * @param unknown $arr * @param string $delimiter * @return multitype: */function singleToMulti($arr, $delimiter = ‘->‘){$endAry = array();foreach ($arr AS $key=>$val) {$sAry = explode($delimiter, $val);$len = count($sAry);$ary = array();for ($i=$len-2; $i>-1; $i--) {if ($i == $len-2) {$ary[$sAry[$i]] = $sAry[$i+1] ;} else {$ary = array($sAry[$i] => $ary);}}$endAry = array_merge_recursive($endAry, $ary);}return $endAry;}

　　實現了數組的升維和降維，也許實現方式不夠好，請批評指正！

 

php數組的升維和降維處理