PHP two-dimensional array deduplication or statistics based on a certain field

This article mainly introduces the tips on deduplication or statistics of PHP two-dimensional array according to a certain field. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

Based on Deduplicate the field province (province), and count the number of occurrences of province (province) in Tianjin

Solution:

$arr = array(
			array('province'=>'甘肃','name'=>'甲'),
			array('province'=>'天津','name'=>'乙'),
			array('province'=>'天津','name'=>'丙')
		);
		$result = array();
		foreach ($arr as $key=>$value){
			$result[$value['province']] += 1;
		}
		dump($result);

$result = array(
			'甘肃'=>1,
			'天津'=>2
		);

Similarly, remove duplication according to the field province (province), and Count the province (province) as the total number of numbers in Tianjin

$arr = array(  
            array('province'=>'甘肃','number'=>100),  
            array('province'=>'天津','number'=>200),  
            array('province'=>'天津','number'=>300)  
); 
需要得到如下结果：

$arr = array(  
            array('province'=>'甘肃','number'=>100),  
            array('province'=>'天津','number'=>500)
);

Solution:

$result = array();
		foreach ($arr as $key=>$value){
			$result[$value['province']] += $value['number'];
		}
		dump($result);

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