Detailed explanation of php function to remove duplicate elements from array and sort by key name

Use PHP to remove duplicate elements in array function

1. The function of this function: remove duplicate elements from the array and sort by key name

function assoc_unique($arr, $key) { 
$tmp_arr = array(); 
foreach($arr as $k => $v) { 
if(in_array($v[$key], $tmp_arr)) { 
unset($arr[$k]); 
} else { 
$tmp_arr[] = $v[$key]; 
} 
} 
sort($arr); 
return $arr; 
}

Usage example:

$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);

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