


How to detect the existence of subarray elements in php two-dimensional array
Detection steps: 1. Use the foreach statement to loop through the outer array elements of the two-dimensional array, the syntax is "foreach($arr as $k=>$v){//loop body}"; 2 . In the loop body, use is_array() to determine whether the outer element "$v" is an array type. If so, use in_array() to determine whether the specified element is in the subarray. The syntax is "if(is_array($v)) {if(in_array(specified element,$v)){//Existence operation}}".
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer
In PHP, you can use the foreach statement and is_array () and in_array() functions to detect the existence of subarray elements.
Implementation steps:
Step 1: Use the foreach statement to loop through the outer array elements of the two-dimensional array
foreach($arr as $k => $v){ //循环体代码 }
Traverse the given $arr array, and in each loop, the value of the current array will be assigned to $v, and the key name will be assigned to $k.
Step 2: In the loop body, use the is_array() function and the in_array() function to determine whether the subarray element exists
Use the is_array() function to determine whether the outer element is an array type
If so, use the in_array() function to determine whether the specified element is in the subarray
if(is_array($v)){ if(in_array(指定元素,$v)){ echo "指定子数组元素存在"; break; } }
Implementation code:
<?php header("content-type:text/html;charset=utf-8"); $arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); var_dump($arr); foreach($arr as $k => $v){ if(is_array($v)){ if(in_array("9",$v)){ echo "指定子数组元素存在"; break; } } } ?>
<?php header("content-type:text/html;charset=utf-8"); function f($arr,$s){ $c=0; foreach($arr as $k => $v){ if(is_array($v)){ if(in_array($s,$v)){ $c=1; break; } } } if($c==1){ echo "指定子数组元素 $s 存在<br>"; }else{ echo "指定子数组元素 $s 不存在<br>"; } } $arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); var_dump($arr); f($arr,9); f($arr,11); ?>
Description:
in_array() function searches whether the specified value exists in the array. Syntax format:in_array ( $search , $array ,$strict)
Description | |
---|---|
Required. 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. |
Recommended study: "
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