统计字符串中相同字母出现的次数并以字符串输出

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/dmt742055597/article/details/83414591

function get_num($str){
		$str_arr = str_split($str);// 字符串转数组
		$x = '';// 字符串转为数组，数组中n-1位置的值
		$string = '';// 结果字符串
		foreach ($str_arr as $k => $v) {
			if($x == $v){
				$sub_str = substr($string, -2);
				$sub_str_arr = str_split($sub_str);
				$z = intval($sub_str_arr[1]) + 1;
				$string = substr($string, 0, -2).$sub_str_arr[0].$z;
			}else{
				$z = 1;
				$string = $string.$v.$z;
			}
			$x = $v;
		}
		return $string;
}

$str = 'abbaacccddddbbbf';
$res = get_num($str);
echo "<pre>";
var_dump($res);// a1b2a2c3d4b3f1