Two-dimensional array sorting problem in PHP_PHP tutorial

Two-dimensional array sorting problem in PHP

To sort two-dimensional arrays in PHP, you can use the PHP built-in function uasort()

[Use user-defined comparison function to sort values ​​in array and maintain index association]

The callback function is as follows: Note that when the return value of the callback function is a negative number or false, it means that the first parameter of the callback function comes first and the second parameter is arranged last

	$person = array(
		array('num'=>'001','id'=>6,'name'=>'zhangsan','age'=>21),
		array('num'=>'001','id'=>7,'name'=>'ahangsan','age'=>23),
		array('num'=>'003','id'=>1,'name'=>'bhangsan','age'=>23),
		array('num'=>'001','id'=>3,'name'=>'dhangsan','age'=>23),
	);

	//负数或者false表示第一个参数应该在前
	function sort_by_name($x,$y){
		return strcasecmp($x['name'],$y['name']);
	}

Use as follows:

uasort($person,'sort_by_name');

The following is a two-dimensional array sorting method for reference and interview use:

	//$array 要排序的数组
	//$row   排序依据列
	//$type  排序类型[asc or desc]
	//return 排好序的数组
	function array_sort($array,$row,$type){
		$array_temp = array();
		foreach($array as $v){
			$array_temp[$v[$row]] = $v;
		}
		if($type == 'asc'){
			ksort($array_temp);
		}elseif($type='desc'){
			krsort($array_temp);
		}else{
			
		}
		return $array_temp;
	}

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Here are some functions of PHP sorting by the way

[sort sorting arrays] is generally applicable to one-dimensional index arrays and will not maintain the index

[rsort sorts the array in reverse order] The usage is the same as sort

[asort sorts the array and maintains the index relationship] Sorts the values, generally suitable for one-dimensional arrays, maintaining the index relationship

[arsort sorts the array in reverse and maintains the index relationship] is consistent with the usage of asort

[ksort sorts the array by key name]

[krsort sorts the array in reverse order by key name]

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