How to remove duplicate values from php array

php Array method to remove duplicate values: 1. Use the "array_unique" function to delete duplicates from a one-dimensional array; 2. Delete duplicates from a two-dimensional array through the "assoc_unique" and "array_unique_fb" methods.

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php Array deduplication (one-dimensional array and two-dimensional array Dimensional array)

Removal of duplicate items in the array

Duplicate items in one-dimensional array:

Use the array_unique function. The usage examples are as follows:

The result is as follows: Array ([0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ).

Duplicates of two-dimensional arrays:

We will discuss two-dimensional arrays in two situations. One is because the value of a certain key name cannot be repeated, and duplicates are deleted; the other is Because the internal one-dimensional arrays cannot be exactly the same, and duplicates are deleted, the following example illustrates:

Because the value of a certain key name cannot be repeated, delete duplicates

 $v) { if(in_array($v[$key], $tmp_arr))//搜索$v[$key]是否在$tmp_arr数组中存在，若存在返回true { unset($arr[$k]); } else { $tmp_arr[] = $v[$key]; } } sort($arr); //sort函数对数组进行排序 return $arr; } $aa = array( array('id' => 123, 'name' => '张三'), array('id' => 123, 'name' => '李四'), array('id' => 124, 'name' => '王五'), array('id' => 125, 'name' => '赵六'), array('id' => 126, 'name' => '赵六') ); $key = 'id'; assoc_unique(&$aa, $key); print_r($aa); ?>

The display result is:

Array ( [0] => Array ( [id] => 123 [name] => 张三 ) [1] => Array ( [id] => 124 [name] => 王五 ) [2] => Array ( [id] => 125 [name] => 赵六 ) [3] => Array ( [id] => 126 [name] => 赵六 ) )

㈡ Because the internal one -dimensional array cannot be exactly the same, delete the duplicate item

 $v){ $temp[$k] = explode(",",$v); //再将拆开的数组重新组装 } return $temp; } $aa = array( array('id' => 123, 'name' => '张三'), array('id' => 123, 'name' => '李四'), array('id' => 124, 'name' => '王五'), array('id' => 123, 'name' => '李四'), array('id' => 126, 'name' => '赵六') ); $bb=array_unique_fb($aa); print_r($bb) ?>

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