How to find data in a two-dimensional ordered array in php (code)

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In a two-dimensional array (each one-dimensional array is the same length), each row is sorted in increasing order from left to right, and each column is sorted in increasing order from top to bottom. Please complete a function, input such a two-dimensional array and an integer, and determine whether the array contains the integer.
1. Two-dimensional array, row increases from left to right, column col increases from top to bottom
2. Define the lower left corner as the comparison point, and the one larger than it is located on the right of it, so col , and col3. Smaller than the lower left corner is located above it, so row--,row>=0

col=0
row=arr.length-1
while row>=0&&col<=arr[0].length-1
    if key==arr[row][col]
        return true
    elseif key>arr[row][col]
        col++
    else
        row-
return false

<?php
//构造一个从上到下，从左到右递增的数组
$arr=array();
$flag=0;
for($i=0;$i<10;$i++){
        $flag=$i*10;
        for($j=0;$j<10;$j++){
                $flag++;
                $arr[$i][]=$flag;
        }   
}
//生成了一个1到100的二维数组

function Find($target, $array){
        $col=0;
        $row=count($array)-1;
        while($row>=0 && $col<=count($array[0])-1){
                if($target==$array[$row][$col]){
                        return array($row,$col);
                }elseif($target>$array[$row][$col]){
                        $col++;
                }else{
                        $row--;
                }   
        }   
        return false;
}
//输出行，列
var_dump(Find(50,$arr));
var_dump($arr);

array(2) {
  [0]=>
  int(4)
  [1]=>
  int(9)
}array(10) {
  [0]=>  array(10) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
    [3]=>
    int(4)
    [4]=>
    int(5)
    [5]=>
    int(6)
    [6]=>
    int(7)
    [7]=>
    int(8)
    [8]=>
    int(9)
    [9]=>
    int(10)
  }
  [1]=>  array(10) {
    [0]=>
    int(11)
    [1]=>
    int(12)
    [2]=>
    int(13)
    [3]=>
    int(14)
    [4]=>
    int(15)
    [5]=>
    int(16)
    [6]=>
    int(17)
    [7]=>
    int(18)
    [8]=>
    int(19)
    [9]=>
    int(20)
  }
  [2]=>  array(10) {
    [0]=>
    int(21)
    [1]=>
    int(22)
    [2]=>
    int(23)
    [3]=>
    int(24)
    [4]=>
    int(25)
    [5]=>
    int(26)
    [6]=>
    int(27)
    [7]=>
    int(28)
    [8]=>
    int(29)
    [9]=>
    int(30)
  }
  [3]=>  array(10) {
    [0]=>
    int(31)
    [1]=>
    int(32)
    [2]=>
    int(33)
    [3]=>
    int(34)
    [4]=>
    int(35)
    [5]=>
    int(36)
    [6]=>
    int(37)
    [7]=>
    int(38)
    [8]=>
    int(39)
    [9]=>
    int(40)
  }
  [4]=>  array(10) {
    [0]=>
    int(41)
    [1]=>
    int(42)
    [2]=>
    int(43)
    [3]=>
    int(44)
    [4]=>
    int(45)
    [5]=>
    int(46)
    [6]=>
    int(47)
    [7]=>
    int(48)
    [8]=>
    int(49)
    [9]=>
    int(50)
  }
  [5]=>  array(10) {
    [0]=>
    int(51)
    [1]=>
    int(52)
    [2]=>
    int(53)
    [3]=>
    int(54)
    [4]=>
    int(55)
    [5]=>
    int(56)
    [6]=>
    int(57)
    [7]=>
    int(58)
    [8]=>
    int(59)
    [9]=>
    int(60)
  }
  [6]=>  array(10) {
    [0]=>
    int(61)
    [1]=>
    int(62)
    [2]=>
    int(63)
    [3]=>
    int(64)
    [4]=>
    int(65)
    [5]=>
    int(66)
    [6]=>
    int(67)
    [7]=>
    int(68)
    [8]=>
    int(69)
    [9]=>
    int(70)
  }
  [7]=>  array(10) {
    [0]=>
    int(71)
    [1]=>
    int(72)
    [2]=>
    int(73)
    [3]=>
    int(74)
    [4]=>
    int(75)
    [5]=>
    int(76)
    [6]=>
    int(77)
    [7]=>
    int(78)
    [8]=>
    int(79)
    [9]=>
    int(80)
  }
  [8]=>  array(10) {
    [0]=>
    int(81)
    [1]=>
    int(82)
    [2]=>
    int(83)
    [3]=>
    int(84)
    [4]=>
    int(85)
    [5]=>
    int(86)
    [6]=>
    int(87)
    [7]=>
    int(88)
    [8]=>
    int(89)
    [9]=>
    int(90)
  }
  [9]=>  array(10) {
    [0]=>
    int(91)
    [1]=>
    int(92)
    [2]=>
    int(93)
    [3]=>
    int(94)
    [4]=>
    int(95)
    [5]=>
    int(96)
    [6]=>
    int(97)
    [7]=>
    int(98)
    [8]=>
    int(99)
    [9]=>
    int(100)
  }
}

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