1. toadstomochi

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    toadstomochi
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+php 配列 重複した要素の削除 array_unique()
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+##配列の重複要素を削除
+
+array_unique()
+
+```php:qiita.php
+$array = ["aaaa","wwww","eeee","aaaa","tttt","WWWW","eeee"];
+$array = (array_unique($array));
+//Array ( [0] => aaaa [1] => wwww [2] => eeee [4] => tttt [5] => WWWW )
+```
+#####連想配列の場合
+```php:qiita.php
+$array = array(
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+ array('kazuki', 'aya', 'yoshiko', 'miki'),
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+);
+
+$array = array_unique($array, SORT_REGULAR);
+//Array ( [0] => Array ( [0] => takuya [1] => jun [2] => yoshiko [3] => miki ) [1] => Array ( [0] => kazuki [1] => aya [2] => yoshiko [3] => miki ) )
+```
+第2引数にSORT_REGULARを指定しました。
+
+####配列内に要素が何種類あるか調べる。
+```php:qiita.php
+$array = ["aaaa","wwww","eeee","aaaa","tttt","WWWW","eeee"];
+$count = count(array_unique($array));
+//5
+```
+```php:qiita.php
+$array = array(
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+ array('kazuki', 'aya', 'yoshiko', 'miki'),
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+);
+
+$count = count(array_unique($array, SORT_REGULAR));
+//2
+
+//要素が全て同じ
+$array = array(
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+ array('takuya', 'jun', 'yoshiko', 'miki'),
+);
+
+$count = count(array_unique($array, SORT_REGULAR));
+//1
+```
+