How to detect how many one-dimensional subarrays there are in a two-dimensional array in PHP

Detection steps: 1. Define an array and assign it a value of 0 to store the number of one-dimensional sub-arrays. The syntax is "$num=0;"; 2. Use the foreach statement to loop through the outer part of the two-dimensional array. Layer array elements, syntax "foreach($arr as $k => $v){//loop body code}"; 3. In the loop body, use the is_array() function and the " " operator to count two-dimensional The number of one-dimensional subarrays in an array, syntax "if(is_array($v)){$num ;}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the foreach statement and is_array () function to count the number of one-dimensional subarrays in a two-dimensional array.

Implementation steps:

Step 1: Define an array and assign it a value of 0, used to store the number of one-dimensional subarrays

$num=0;

Step 2: Use the foreach statement to loop through the outer array elements of the two-dimensional array

foreach($arr as $k => $v){
//循环体代码
}

• Traverse the given $arr array, in each loop, the value of the current array will be assigned to $v, and the key name will be assigned to $k.

Step 3: In the loop body, use the is_array() function and the " " operator to count the number of one-dimensional sub-arrays in the two-dimensional array

Use the is_array() function to detect whether the current element is an array type (that is, whether it is a one-dimensional subarray)

• If so, use the " " operator to change the $num variable Add 1 to the value
  

if(is_array($v)){
	$num++;
}

Full implementation code:

function f($arr){
	$num=0;
	foreach($arr as $v){
		if(is_array($v)){
			$num++;
		}
	}
	echo "一维子数组的数量为：".$num;
}

Call the above f($arr) function

$arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); 
var_dump($arr);
f($arr);

$arr = array(array(2),array(4),array(6),array(8)); 
var_dump($arr);
f($arr);

---

Description: is_array() function

in_array() function Searches an array for a specified value. Syntax format:

in_array ( $search , $array ,$strict)

##ParameterDescriptionRequired. Specifies the value to search for in the array. Required. Specifies the array to search.             Optional. If this parameter is set to TRUE, the in_array() function checks whether the data being searched is of the same type as the value of the array.

search
array
strict

Return value: TRUE if the value is found in the array, FALSE otherwise.

Recommended learning: "

PHP Video Tutorial", "PHP ARRAY"

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