php去除數組中重複資料的二個例子

/** * 去除數組中重複資料 * by bbs.it-home.org **/ $input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer"); //$result = array_unique($input); //去除重複元素 $result = a_array_unique($input); //只留下單一元素 foreach($result as $aa) { echo $aa." "; } function multi_unique($array) { foreach ($array as $k=>$na) $new[$k] = serialize($na); $uniq = array_unique($new); foreach($uniq as $k=>$ser) $new1[$k] = unserialize($ser); return ($new1); } function a_array_unique($array)//寫的比較好 { $out = array(); foreach ($array as $key=>$value) { if (!in_array($value, $out)) { $out[$key] = $value; } } return $out; } ?> 複製代碼 PHP內建的array_unique函數只適用於一維數組，對多維陣列並不適用，這裡實現一個php二維數組去重複的array_unique函數。 例子： /** * php二維數組去除重複資料 * by bbs.it-home.org */ function unique_arr($array2D,$stkeep=false,$ndformat=true) { // 判斷是否保留一級數組鍵 (一級數組鍵可以為非數字) if($stkeep) $stArr = array_keys($array2D); // 判斷是否保留二級數組鍵 (所有二級數組鍵必須相同) if($ndformat) $ndArr = array_keys(end($array2D)); //降維,也可以用implode,將一維數群組轉換為用逗號串連的字串 foreach ($array2D as $v){ $v = join(",",$v); $temp[] = $v; } //去掉重複的字串,也就是重複的一維數組 $temp = array_unique($temp); //再將拆開的數組重新組裝 foreach ($temp as $k => $v) { if($stkeep) $k = $stArr[$k]; if($ndformat) { $tempArr = explode(",",$v); foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval; } else $output[$k] = explode(",",$v); } return $output; } 複製代碼 調用樣本： //數組去重 $array2D = array('first'=>array('title'=>'1111','date'=>'2222'),'second'=>array('title'=>'1111','date'=>'2222'),'third'=>array('title'=>'2222','date'=>'3333')); print_r($array2D); print_r(unique_arr($array2D,true)); 複製代碼

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