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Home > Article > Backend Development > 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)
Description | |
---|---|
search | Required. Specifies the value to search for in the array.|
array | Required. Specifies the array to search.|
strict | 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.
PHP Video Tutorial", "PHP ARRAY"
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